[
  {
    "sku": "6403-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6403",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 23.8,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 16200,
    "reference_speed_rpm": 11600,
    "weight_g": 270,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6403 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 17 mm bore exists for high radial load at moderate rpm; its 62 mm OD and 17 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.",
      "Storage matters for open bearings: 6403-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6403 units.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6403 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6403 at 16200 r/min mechanical limiting speed (thermal reference speed 11600 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "At 17 mm bore the 6403 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.",
      "At 23.8 kN dynamic load rating (C) and 11.5 kN static (C0), 6403 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 270 g, 6403 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 17×62×17 mm envelope of 6403 gives a D/d ratio of 3.65 and 22.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 23.8/11.5 kN load ratings, mass 270 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6403-FAG on the 17×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6403 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6403: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6403-FAG bearing?",
        "a": "A 6403-FAG deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6403-FAG need?",
        "a": "The open 6403-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6403 bore code work?",
        "a": "The last two digits of 6403 are bore code 17, giving 17 × 5 = 17 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 6403?",
        "a": "FAG lists the open 6403 under the bare designation 6403-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6403-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6403-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6403-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6403-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6403",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6403",
      "6403-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61804",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.02,
    "static_load_kN": 2.46,
    "limiting_speed_rpm": 33500,
    "reference_speed_rpm": 17600,
    "weight_g": 18,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61804-FAG.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.",
      "Storage matters for open bearings: 61804-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61804 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61804-FAG-C3. No clearance suffix means normal CN clearance.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61804 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "The 33500 r/min mechanical limiting speed puts 61804 at the top of the HR 1 deep-groove speed range (thermal reference speed 17600 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.",
      "The 20 mm bore puts 61804 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.02 kN dynamic load rating (C) and 2.46 kN static (C0), 61804 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 18 g, 61804 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.02/2.46 kN load ratings, mass 18 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61804-FAG on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-FAG bearing?",
        "a": "A 61804-FAG deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 20 mm bore?",
        "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61804 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61804 uses the same ISO 15 envelope (20×32×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 61804?",
        "a": "FAG lists the open 61804 under the bare designation 61804-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Is 61804-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804",
      "61804-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61804-2RSR",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.02,
    "static_load_kN": 2.46,
    "limiting_speed_rpm": 11500,
    "weight_g": 18,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61804-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 20 mm shaft for 61804 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.",
      "Contact seals add drag and heat: 61804-2RS-FAG runs slower and cooler-limited than the open 61804; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61804-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61804-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 11500 r/min mechanical limiting speed, 61804 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 20 mm bore puts 61804 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.02 kN dynamic load rating (C) and 2.46 kN static (C0), 61804 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 18 g, 61804 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.02/2.46 kN load ratings, mass 18 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61804-2RSR on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-2RS-FAG bearing?",
        "a": "A 61804-2RS-FAG deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61804-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61804-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61804 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61804-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 61804?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61804-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×32×7 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61804 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61804-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804-2RS",
      "61804-2rs",
      "61804-2RSR",
      "61804-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61804-2Z",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.02,
    "static_load_kN": 2.46,
    "limiting_speed_rpm": 28500,
    "reference_speed_rpm": 17600,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "61804-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 32 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61804-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.",
      "Do not wash 61804-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61804-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Schaeffler HR 1 lists the shielded version as 61804-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "The 28500 r/min mechanical limiting speed puts 61804 at the top of the HR 1 deep-groove speed range (thermal reference speed 17600 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.",
      "The 20 mm bore puts 61804 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.02 kN dynamic load rating (C) and 2.46 kN static (C0), 61804 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.02/2.46 kN load ratings here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61804-2Z on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61804; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-ZZ-FAG bearing?",
        "a": "A 61804-ZZ-FAG deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 20 mm bore?",
        "a": "618 is an extra-thin section: 32×7 mm, only 6.0 mm radial section at 20 mm bore, far smaller than a 6204, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61804 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61804 uses the same ISO 15 envelope (20×32×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 61804?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61804-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×32×7 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61804 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61804-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804-ZZ",
      "61804-zz",
      "61804-2Z",
      "61804-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61904",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6.38,
    "static_load_kN": 3.68,
    "limiting_speed_rpm": 28500,
    "reference_speed_rpm": 17000,
    "weight_g": 40,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61904 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section at 20 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61904-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 20×37×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61904 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61904 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "The 28500 r/min mechanical limiting speed puts 61904 at the top of the HR 1 deep-groove speed range (thermal reference speed 17000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.",
      "The 20 mm bore puts 61904 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61904 at 6.38 kN dynamic (C) and 3.68 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 40 g, 61904 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 6.38/3.68 kN load ratings, mass 40 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61904-FAG on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61904; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-FAG bearing?",
        "a": "A 61904-FAG deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61904-FAG need?",
        "a": "The open 61904-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61904 bore code work?",
        "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 61904?",
        "a": "FAG lists the open 61904 under the bare designation 61904-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61904 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61904-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904",
      "61904-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61904-2RSR",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6.38,
    "static_load_kN": 3.68,
    "limiting_speed_rpm": 10600,
    "weight_g": 37,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61904-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 61904-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "A 20 mm shaft for 61904 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section at 20 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61904-2RS-FAG runs slower and cooler-limited than the open 61904; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61904-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61904-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 10600 r/min mechanical limiting speed, 61904 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 20 mm bore puts 61904 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61904 at 6.38 kN dynamic (C) and 3.68 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 37 g, 61904 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 6.38/3.68 kN load ratings, mass 37 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61904-2RSR on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61904 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-2RS-FAG bearing?",
        "a": "A 61904-2RS-FAG deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61904-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61904-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61904 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61904-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 61904?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61904-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×37×9 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61904 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61904-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904-2RS",
      "61904-2rs",
      "61904-2RSR",
      "61904-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61904-2Z",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6.38,
    "static_load_kN": 3.68,
    "limiting_speed_rpm": 24200,
    "reference_speed_rpm": 17000,
    "weight_g": 37,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61904-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61904-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 20 mm shaft for 61904 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61904-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61904-2RS for that.",
      "Do not wash 61904-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 37 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61904-ZZ-FAG.",
      "Schaeffler HR 1 lists the shielded version as 61904-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61904 at 24200 r/min mechanical limiting speed (thermal reference speed 17000 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 20 mm bore puts 61904 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61904 at 6.38 kN dynamic (C) and 3.68 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 37 g, 61904 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 6.38/3.68 kN load ratings, mass 37 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61904-2Z on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61904 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61904; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-ZZ-FAG bearing?",
        "a": "A 61904-ZZ-FAG deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61904-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61904-ZZ-FAG need?",
        "a": "61904-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the FAG suffix for a sealed 61904?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61904-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×37×9 mm ISO 15 envelope."
      },
      {
        "q": "Is 61904-2Z an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904-ZZ",
      "61904-zz",
      "61904-2Z",
      "61904-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16004",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16004",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.91,
    "static_load_kN": 4.48,
    "limiting_speed_rpm": 26000,
    "reference_speed_rpm": 13800,
    "weight_g": 48,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 20 mm shaft for 16004 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Because the 160xx narrow section shares the 42 mm OD of the 6004 at 20 mm bore but is only 8 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "The open 16004 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 16004 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 16004 drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 16004 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "The 26000 r/min mechanical limiting speed puts 16004 at the top of the HR 1 deep-groove speed range (thermal reference speed 13800 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.",
      "The 20 mm bore puts 16004 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 16004 at 7.91 kN dynamic (C) and 4.48 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 48 g, 16004 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×42×8 mm envelope of 16004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 7.91/4.48 kN load ratings, mass 48 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16004 on the 20×42×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16004 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 16004 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16004 bearing?",
        "a": "A 16004 deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 8 mm width (0.787 × 1.654 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 16004 mean?",
        "a": "A bare 16004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 16000 compare with other series at the same 20 mm bore?",
        "a": "160 is the narrow extra-light section: 42×8 mm with an 11.0 mm radial section at 20 mm bore. It has the same bore and outside diameter as the 6004 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site."
      },
      {
        "q": "What is the FAG order number for an open 16004?",
        "a": "FAG lists the open 16004 under the bare designation 16004; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 16004."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16004-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16004"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6004-C",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.6,
    "static_load_kN": 5,
    "limiting_speed_rpm": 27500,
    "reference_speed_rpm": 19700,
    "weight_g": 62,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6004 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-FAG.",
      "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.",
      "The open 6004-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6004 units.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6004-FAG.",
      "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6004 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "The 27500 r/min mechanical limiting speed puts 6004 at the top of the HR 1 deep-groove speed range (thermal reference speed 19700 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.",
      "The 20 mm bore puts 6004 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6004 at 10.6 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 62 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.6/5 kN load ratings, mass 62 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6004-C on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6004: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-FAG bearing?",
        "a": "A 6004-FAG deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6004 bore code work?",
        "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6004 mean?",
        "a": "A bare 6004 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6004?",
        "a": "FAG lists the open 6004 under the bare designation 6004-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6004 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6004-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004",
      "6004-C",
      "6004-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6004-C-2HRS",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.6,
    "static_load_kN": 5,
    "limiting_speed_rpm": 15300,
    "weight_g": 66,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6004-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-2RS-FAG.",
      "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6004-2RS-FAG runs slower and cooler-limited than the open 6004; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6004-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Never mix components between two 6004-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6004-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG rates 6004 at 15300 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 20 mm bore puts 6004 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6004 at 10.6 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 66 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.6/5 kN load ratings, mass 66 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6004-C-2HRS on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6004 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-2RS-FAG bearing?",
        "a": "A 6004-2RS-FAG deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6004 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6004 uses the same ISO 15 envelope (20×42×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6004-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6004-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6004 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6004?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6004-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×42×12 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6004 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6004-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004-2RS",
      "6004-2rs",
      "6004-C-2HRS",
      "6004-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6004-C-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.6,
    "static_load_kN": 5,
    "limiting_speed_rpm": 23200,
    "reference_speed_rpm": 19700,
    "weight_g": 65,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6004-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6004-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6004 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6004-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6004-2RS for that.",
      "Shielded 6004-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6004-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6004-ZZ-FAG.",
      "Schaeffler HR 1 lists the shielded version as 6004-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6004 at 23200 r/min mechanical limiting speed (thermal reference speed 19700 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 20 mm bore puts 6004 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6004 at 10.6 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 65 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.6/5 kN load ratings, mass 65 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6004-C-2Z on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6004; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6004: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-ZZ-FAG bearing?",
        "a": "A 6004-ZZ-FAG deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6004 bore code work?",
        "a": "The last two digits of 6004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6004-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 6004?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6004-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×42×12 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6004 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6004-C-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004-ZZ",
      "6004-zz",
      "6004-C-2Z",
      "6004-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6204-C",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.7,
    "static_load_kN": 6.6,
    "limiting_speed_rpm": 24300,
    "reference_speed_rpm": 18100,
    "weight_g": 100,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6204 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-FAG.",
      "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6204-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6204-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 6204-FAG and shows up later as two-point loaded raceway wear.",
      "The open 6204 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6204 at 24300 r/min mechanical limiting speed (thermal reference speed 18100 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 20 mm bore puts 6204 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6204 at 14.7 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 100 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.7/6.6 kN load ratings, mass 100 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6204-C on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6204; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-FAG bearing?",
        "a": "A 6204-FAG deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6204 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6204-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6204-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 6204?",
        "a": "FAG lists the open 6204 under the bare designation 6204-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6204-C."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204",
      "6204-C",
      "6204-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6204-C-2HRS",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.7,
    "static_load_kN": 6.6,
    "limiting_speed_rpm": 14500,
    "weight_g": 104,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6204-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-2RS-FAG.",
      "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6204-2RS-FAG runs slower and cooler-limited than the open 6204; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6204-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 6204-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6204-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6204-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG rates 6204 at 14500 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 20 mm bore puts 6204 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6204 at 14.7 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 104 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.7/6.6 kN load ratings, mass 104 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6204-C-2HRS on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6204 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6204; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-2RS-FAG bearing?",
        "a": "A 6204-2RS-FAG deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6200 compare with other series at the same 20 mm bore?",
        "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated."
      },
      {
        "q": "Are 6204 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6204?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6204-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×47×14 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6204 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6204-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204-2RS",
      "6204-2rs",
      "6204-C-2HRS",
      "6204-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6204-C-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.7,
    "static_load_kN": 6.6,
    "limiting_speed_rpm": 20600,
    "reference_speed_rpm": 18100,
    "weight_g": 105,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6204-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6204-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-ZZ-FAG.",
      "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6204-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6204-2RS for that.",
      "Shielded 6204-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 14 mm-wide ring of 6204-ZZ-FAG drags the lip and overheats it.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6204-ZZ-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the shielded version as 6204-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6204 at 20600 r/min mechanical limiting speed (thermal reference speed 18100 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 20 mm bore puts 6204 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6204 at 14.7 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 105 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.7/6.6 kN load ratings, mass 105 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6204-C-2Z on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-ZZ-FAG bearing?",
        "a": "A 6204-ZZ-FAG deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6204-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6204-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6204-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6204?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6204-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×47×14 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6204 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6204-C-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204-ZZ",
      "6204-zz",
      "6204-C-2Z",
      "6204-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6304",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16.9,
    "static_load_kN": 7.9,
    "limiting_speed_rpm": 19800,
    "reference_speed_rpm": 14400,
    "weight_g": 144,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6304 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6304-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6304 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 6304-FAG and shows up later as two-point loaded raceway wear.",
      "The open 6304 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6304 at 19800 r/min mechanical limiting speed (thermal reference speed 14400 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 20 mm bore puts 6304 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 16.9 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 144 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 16.9/7.9 kN load ratings, mass 144 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6304-FAG on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6304; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-FAG bearing?",
        "a": "A 6304-FAG deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6304-FAG need?",
        "a": "The open 6304-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6304 bore code work?",
        "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 6304?",
        "a": "FAG lists the open 6304 under the bare designation 6304-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Is 6304-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304",
      "6304-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6304-2RSR",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16.9,
    "static_load_kN": 7.9,
    "limiting_speed_rpm": 8800,
    "weight_g": 155,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6304-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6304-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6304-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.",
      "Contact seals add drag and heat: 6304-2RS-FAG runs slower and cooler-limited than the open 6304; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6304-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 6304-2RS-FAG and shows up later as two-point loaded raceway wear.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6304-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 8800 r/min mechanical limiting speed, 6304 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 20 mm bore puts 6304 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 16.9 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 155 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 16.9/7.9 kN load ratings, mass 155 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6304-2RSR on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6304; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-2RS-FAG bearing?",
        "a": "A 6304-2RS-FAG deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6304 bore code work?",
        "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6304-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the FAG suffix for a sealed 6304?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6304-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×52×15 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6304-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304-2RS",
      "6304-2rs",
      "6304-2RSR",
      "6304-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6304-2Z",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16.9,
    "static_load_kN": 7.9,
    "limiting_speed_rpm": 16800,
    "reference_speed_rpm": 14400,
    "weight_g": 146,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6304-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6304-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6304-ZZ-FAG.",
      "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6304-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6304-2RS for that.",
      "Do not wash 6304-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6304-ZZ-FAG.",
      "Schaeffler HR 1 lists the shielded version as 6304-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6304 at 16800 r/min mechanical limiting speed (thermal reference speed 14400 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 20 mm bore puts 6304 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 16.9 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 146 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 16.9/7.9 kN load ratings, mass 146 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6304-2Z on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6304: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-ZZ-FAG bearing?",
        "a": "A 6304-ZZ-FAG deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6304-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6304-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6304 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6304-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6304?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6304-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 20×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6304 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6304-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304-ZZ",
      "6304-zz",
      "6304-2Z",
      "6304-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6404-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6404",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 30.5,
    "static_load_kN": 15,
    "limiting_speed_rpm": 14000,
    "reference_speed_rpm": 11700,
    "weight_g": 414,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6404-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 20×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6404-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6404 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6404 at 14000 r/min mechanical limiting speed (thermal reference speed 11700 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 20 mm bore puts 6404 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 30.5 kN dynamic load rating (C) and 15 kN static (C0), 6404 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 414 g, 6404 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 20×72×19 mm envelope of 6404 gives a D/d ratio of 3.60 and 26.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 30.5/15 kN load ratings, mass 414 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6404-FAG on the 20×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6404 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6404-FAG bearing?",
        "a": "A 6404-FAG deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6404 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6404 uses the same ISO 15 envelope (20×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6404-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6404-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6404 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 6404?",
        "a": "FAG lists the open 6404 under the bare designation 6404-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Is 6404-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6404-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6404-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6404-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6404",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=248",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6404",
      "6404-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61805",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.3,
    "static_load_kN": 2.94,
    "limiting_speed_rpm": 28000,
    "reference_speed_rpm": 13900,
    "weight_g": 23,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61805 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 25 mm shaft for 61805 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6205.",
      "The open 61805-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 25×37×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61805 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61805 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "The 28000 r/min mechanical limiting speed puts 61805 at the top of the HR 1 deep-groove speed range (thermal reference speed 13900 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.",
      "The 25 mm bore puts 61805 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.3 kN dynamic load rating (C) and 2.94 kN static (C0), 61805 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 23 g, 61805 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.3/2.94 kN load ratings, mass 23 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61805-FAG on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61805 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61805; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-FAG bearing?",
        "a": "A 61805-FAG deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61805-FAG need?",
        "a": "The open 61805-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61805 bore code work?",
        "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 61805?",
        "a": "FAG lists the open 61805 under the bare designation 61805-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Is 61805-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805",
      "61805-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61805-2RSR",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.3,
    "static_load_kN": 2.94,
    "limiting_speed_rpm": 9500,
    "weight_g": 21,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61805-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61805-2RS-FAG.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.",
      "Contact seals add drag and heat: 61805-2RS-FAG runs slower and cooler-limited than the open 61805; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61805-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61805-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 9500 r/min mechanical limiting speed, 61805 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 25 mm bore puts 61805 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.3 kN dynamic load rating (C) and 2.94 kN static (C0), 61805 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 21 g, 61805 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.3/2.94 kN load ratings, mass 21 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61805-2RSR on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61805: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-2RS-FAG bearing?",
        "a": "A 61805-2RS-FAG deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61800 compare with other series at the same 25 mm bore?",
        "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61805 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61805 uses the same ISO 15 envelope (25×37×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 61805?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61805-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×37×7 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61805 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61805-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805-2RS",
      "61805-2rs",
      "61805-2RSR",
      "61805-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61805-2Z",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.3,
    "static_load_kN": 2.94,
    "limiting_speed_rpm": 24000,
    "reference_speed_rpm": 13900,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "61805-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61805-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61805-ZZ-FAG.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.",
      "Do not wash 61805-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61805-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61805-ZZ-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the shielded version as 61805-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61805 at 24000 r/min mechanical limiting speed (thermal reference speed 13900 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 61805 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.3 kN dynamic load rating (C) and 2.94 kN static (C0), 61805 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.3/2.94 kN load ratings here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61805-2Z on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61805: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-ZZ-FAG bearing?",
        "a": "A 61805-ZZ-FAG deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 25 mm bore?",
        "a": "618 is an extra-thin section: 37×7 mm, only 6.0 mm radial section at 25 mm bore, far smaller than a 6205, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61805 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61805 uses the same ISO 15 envelope (25×37×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 61805?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61805-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×37×7 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61805 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61805-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805-ZZ",
      "61805-zz",
      "61805-2Z",
      "61805-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61905",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.01,
    "static_load_kN": 4.55,
    "limiting_speed_rpm": 24200,
    "reference_speed_rpm": 13500,
    "weight_g": 42,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Storage matters for open bearings: 61905-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61905 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905-FAG.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61905 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61905 at 24200 r/min mechanical limiting speed (thermal reference speed 13500 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 61905 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61905 at 7.01 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 42 g, 61905 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 7.01/4.55 kN load ratings, mass 42 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61905-FAG on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61905: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61905 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-FAG bearing?",
        "a": "A 61905-FAG deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 25 mm bore?",
        "a": "619 is a thin section one step above 618: 42×9 mm with an 8.5 mm radial section at 25 mm bore; a 6205 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61905 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 61905?",
        "a": "FAG lists the open 61905 under the bare designation 61905-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61905 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61905-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905",
      "61905-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61905-2RSR",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.01,
    "static_load_kN": 4.55,
    "limiting_speed_rpm": 8700,
    "weight_g": 47,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61905-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 42 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 61905-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61905-2RS-FAG.",
      "The 619xx thin section at 25 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61905-2RS-FAG runs slower and cooler-limited than the open 61905; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61905-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905-2RS-FAG.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61905-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61905-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 8700 r/min mechanical limiting speed, 61905 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 25 mm bore puts 61905 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61905 at 7.01 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 47 g, 61905 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 7.01/4.55 kN load ratings, mass 47 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61905-2RSR on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61905 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61905: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-2RS-FAG bearing?",
        "a": "A 61905-2RS-FAG deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61905 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61905-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61905-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 61905?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61905-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×42×9 mm ISO 15 envelope."
      },
      {
        "q": "Is 61905-2RSR an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905-2RS",
      "61905-2rs",
      "61905-2RSR",
      "61905-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61905-2Z",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.01,
    "static_load_kN": 4.55,
    "limiting_speed_rpm": 20500,
    "reference_speed_rpm": 13500,
    "weight_g": 45,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 61905-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61905-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61905-2RS for that.",
      "Do not wash 61905-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Schaeffler HR 1 lists the shielded version as 61905-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61905 at 20500 r/min mechanical limiting speed (thermal reference speed 13500 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 61905 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61905 at 7.01 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At only 45 g, 61905 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 7.01/4.55 kN load ratings, mass 45 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61905-2Z on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61905: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-ZZ-FAG bearing?",
        "a": "A 61905-ZZ-FAG deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61905 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61905-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61905-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 61905?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61905-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×42×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61905-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905-ZZ",
      "61905-zz",
      "61905-2Z",
      "61905-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16005",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16005",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8.86,
    "static_load_kN": 5.61,
    "limiting_speed_rpm": 22200,
    "reference_speed_rpm": 11600,
    "weight_g": 53,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "16005 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 05 by five gives the 25 mm bore; the 47 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 16005.",
      "Because the 160xx narrow section shares the 47 mm OD of the 6005 at 25 mm bore but is only 8 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "The open 16005 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×47×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16005 units.",
      "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 16005 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 16005 at 22200 r/min mechanical limiting speed (thermal reference speed 11600 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 16005 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 16005 at 8.86 kN dynamic (C) and 5.61 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 53 g, 16005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×8 mm envelope of 16005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 8.86/5.61 kN load ratings, mass 53 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16005 on the 25×47×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16005 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 16005: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16005 bearing?",
        "a": "A 16005 deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 8 mm width (0.984 × 1.85 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 16005 mean?",
        "a": "A bare 16005 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 16000 compare with other series at the same 25 mm bore?",
        "a": "160 is the narrow extra-light section: 47×8 mm with an 11.0 mm radial section at 25 mm bore. It has the same bore and outside diameter as the 6005 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site."
      },
      {
        "q": "What is the FAG order number for an open 16005?",
        "a": "FAG lists the open 16005 under the bare designation 16005; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 16005."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16005-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×47×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16005"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6005-C",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 6.5,
    "limiting_speed_rpm": 23700,
    "reference_speed_rpm": 16400,
    "weight_g": 70,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6005 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 47 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6005-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 25×47×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6005 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 12 mm-wide ring of 6005-FAG drags the lip and overheats it.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6005 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6005 at 23700 r/min mechanical limiting speed (thermal reference speed 16400 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 6005 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6005 at 12.6 kN dynamic (C) and 6.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 70 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 12.6/6.5 kN load ratings, mass 70 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6005-C on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6005; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-FAG bearing?",
        "a": "A 6005-FAG deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6005-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6005-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6005 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6005-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 6005?",
        "a": "FAG lists the open 6005 under the bare designation 6005-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Is 6005-C an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005",
      "6005-C",
      "6005-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6005-C-2HRS",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 6.5,
    "limiting_speed_rpm": 12900,
    "weight_g": 75,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6005-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6005 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6005-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6005-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6005-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG rates 6005 at 12900 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 25 mm bore puts 6005 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6005 at 12.6 kN dynamic (C) and 6.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 75 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 12.6/6.5 kN load ratings, mass 75 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6005-C-2HRS on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6005 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-2RS-FAG bearing?",
        "a": "A 6005-2RS-FAG deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6005-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 25 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the FAG suffix for a sealed 6005?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6005-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×47×12 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6005 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6005-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005-2RS",
      "6005-2rs",
      "6005-C-2HRS",
      "6005-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6005-C-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 6.5,
    "limiting_speed_rpm": 20200,
    "reference_speed_rpm": 16400,
    "weight_g": 74,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6005-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6005 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.",
      "Do not wash 6005-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6005-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 6005-ZZ-FAG and shows up later as two-point loaded raceway wear.",
      "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Schaeffler HR 1 lists the shielded version as 6005-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6005 at 20200 r/min mechanical limiting speed (thermal reference speed 16400 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 6005 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6005 at 12.6 kN dynamic (C) and 6.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 74 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 12.6/6.5 kN load ratings, mass 74 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6005-C-2Z on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6005; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6005 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-ZZ-FAG bearing?",
        "a": "A 6005-ZZ-FAG deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 25 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (47×12 mm, 11.0 mm radial section) at 25 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6005 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6005 uses the same ISO 15 envelope (25×47×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6005?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6005-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×47×12 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6005 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6005-C-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005-ZZ",
      "6005-zz",
      "6005-C-2Z",
      "6005-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6205-C",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 7.8,
    "limiting_speed_rpm": 21600,
    "reference_speed_rpm": 16000,
    "weight_g": 121,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6205-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6205 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6205-FAG drags the lip and overheats it.",
      "Never mix components between two 6205-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6205 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6205 at 21600 r/min mechanical limiting speed (thermal reference speed 16000 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 6205 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 15.9 kN dynamic load rating (C) and 7.8 kN static (C0), 6205 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 121 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.9/7.8 kN load ratings, mass 121 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6205-C on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6205 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6205: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-FAG bearing?",
        "a": "A 6205-FAG deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6205 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6205-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6205-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6205 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 6205?",
        "a": "FAG lists the open 6205 under the bare designation 6205-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Is 6205-C an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205",
      "6205-C",
      "6205-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6205-C-2HRS",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 7.8,
    "limiting_speed_rpm": 12200,
    "weight_g": 127,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6205-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6205-2RS-FAG.",
      "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6205-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6205-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6205-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6205-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG rates 6205 at 12200 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 25 mm bore puts 6205 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 15.9 kN dynamic load rating (C) and 7.8 kN static (C0), 6205 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 127 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.9/7.8 kN load ratings, mass 127 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6205-C-2HRS on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6205 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-2RS-FAG bearing?",
        "a": "A 6205-2RS-FAG deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6205-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6205-2RS-FAG need?",
        "a": "6205-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6205 with a housing grease fitting instead."
      },
      {
        "q": "What is the FAG suffix for a sealed 6205?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6205-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Is 6205-C-2HRS an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205-2RS",
      "6205-2rs",
      "6205-C-2HRS",
      "6205-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6205-C-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 7.8,
    "limiting_speed_rpm": 18400,
    "reference_speed_rpm": 16000,
    "weight_g": 130,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6205-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6205-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6205-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.",
      "Do not wash 6205-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6205-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6205-ZZ-FAG drags the lip and overheats it.",
      "Schaeffler HR 1 lists the shielded version as 6205-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6205 at 18400 r/min mechanical limiting speed (thermal reference speed 16000 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 25 mm bore puts 6205 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 15.9 kN dynamic load rating (C) and 7.8 kN static (C0), 6205 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 130 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.9/7.8 kN load ratings, mass 130 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6205-C-2Z on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6205; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-ZZ-FAG bearing?",
        "a": "A 6205-ZZ-FAG deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6205-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6205-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6205 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6205-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6205?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6205-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6205 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6205-C-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205-ZZ",
      "6205-zz",
      "6205-C-2Z",
      "6205-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6305-C",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 17800,
    "reference_speed_rpm": 13500,
    "weight_g": 217,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6305-FAG.",
      "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.",
      "The open 6305-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6305 units.",
      "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6305-FAG.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 17 mm-wide ring of 6305-FAG drags the lip and overheats it.",
      "The open 6305 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6305 at 17800 r/min mechanical limiting speed (thermal reference speed 13500 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 25 mm bore puts 6305 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 26.5 kN dynamic load rating (C) and 11.5 kN static (C0), 6305 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 217 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 26.5/11.5 kN load ratings, mass 217 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6305-C on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6305: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6305; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-FAG bearing?",
        "a": "A 6305-FAG deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6305-FAG need?",
        "a": "The open 6305-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6305 bore code work?",
        "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 6305?",
        "a": "FAG lists the open 6305 under the bare designation 6305-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Is 6305-C an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305",
      "6305-C",
      "6305-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6305-C-2HRS",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 11300,
    "weight_g": 240,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6305-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6305-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6305-2RS-FAG runs slower and cooler-limited than the open 6305; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6305-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6305-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6305-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 11300 r/min mechanical limiting speed, 6305 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 25 mm bore puts 6305 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 26.5 kN dynamic load rating (C) and 11.5 kN static (C0), 6305 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 240 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 26.5/11.5 kN load ratings, mass 240 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6305-C-2HRS on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6305; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6305: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-2RS-FAG bearing?",
        "a": "A 6305-2RS-FAG deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6305 bore code work?",
        "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6305-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the FAG suffix for a sealed 6305?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6305-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×62×17 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6305 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6305-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305-2RS",
      "6305-2rs",
      "6305-C-2HRS",
      "6305-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6305-C-2Z",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 26.5,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 15100,
    "reference_speed_rpm": 13500,
    "weight_g": 224,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6305-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 62 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6305-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6305 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.",
      "ZZ shields are non-contact: 6305-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6305-2RS for that.",
      "Shielded 6305-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6305-ZZ-FAG.",
      "Schaeffler HR 1 lists the shielded version as 6305-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6305 at 15100 r/min mechanical limiting speed (thermal reference speed 13500 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 25 mm bore puts 6305 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 26.5 kN dynamic load rating (C) and 11.5 kN static (C0), 6305 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 224 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 26.5/11.5 kN load ratings, mass 224 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6305-C-2Z on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6305 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-ZZ-FAG bearing?",
        "a": "A 6305-ZZ-FAG deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6305-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6305-ZZ-FAG need?",
        "a": "6305-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the FAG suffix for a sealed 6305?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6305-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 25×62×17 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6305-C-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305-ZZ",
      "6305-zz",
      "6305-C-2Z",
      "6305-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6405-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6405",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 36.12,
    "static_load_kN": 19.45,
    "limiting_speed_rpm": 12400,
    "reference_speed_rpm": 10100,
    "weight_g": 515,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6405 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 80 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6405-FAG.",
      "The 64xx heavy section at 25 mm bore exists for high radial load at moderate rpm; its 80 mm OD and 21 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.",
      "Storage matters for open bearings: 6405-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6405 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6405-FAG.",
      "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6405-FAG.",
      "The open 6405 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6405 at 12400 r/min mechanical limiting speed (thermal reference speed 10100 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 25 mm bore puts 6405 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6405 at 36.12 kN dynamic (C) and 19.45 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 515 g, 6405 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×80×21 mm envelope of 6405 gives a D/d ratio of 3.20 and 27.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 36.12/19.45 kN load ratings, mass 515 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6405-FAG on the 25×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6405 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6405; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6405-FAG bearing?",
        "a": "A 6405-FAG deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6405-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6405-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6405 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6405-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 6405?",
        "a": "FAG lists the open 6405 under the bare designation 6405-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6405 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6405-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6405-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6405-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6405-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6405",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=250",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6405",
      "6405-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61806",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.45,
    "static_load_kN": 3.44,
    "limiting_speed_rpm": 24500,
    "reference_speed_rpm": 11500,
    "weight_g": 27,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 30 mm shaft for 61806 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.",
      "The open 61806-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 30×42×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61806-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 61806-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 61806-FAG and shows up later as two-point loaded raceway wear.",
      "The open 61806 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61806 at 24500 r/min mechanical limiting speed (thermal reference speed 11500 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 30 mm bore puts 61806 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.45 kN dynamic load rating (C) and 3.44 kN static (C0), 61806 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 27 g, 61806 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.45/3.44 kN load ratings, mass 27 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61806-FAG on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61806; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-FAG bearing?",
        "a": "A 61806-FAG deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 30 mm bore?",
        "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61806 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61806 uses the same ISO 15 envelope (30×42×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 61806?",
        "a": "FAG lists the open 61806 under the bare designation 61806-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61806-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806",
      "61806-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61806-2RSR",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.45,
    "static_load_kN": 3.44,
    "limiting_speed_rpm": 8100,
    "weight_g": 27,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61806-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 61806-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 30 mm shaft for 61806 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.",
      "Contact seals add drag and heat: 61806-2RS-FAG runs slower and cooler-limited than the open 61806; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61806-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 61806-2RS-FAG and shows up later as two-point loaded raceway wear.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61806-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 8100 r/min mechanical limiting speed, 61806 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 30 mm bore puts 61806 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.45 kN dynamic load rating (C) and 3.44 kN static (C0), 61806 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 27 g, 61806 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.45/3.44 kN load ratings, mass 27 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61806-2RSR on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61806 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61806; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-2RS-FAG bearing?",
        "a": "A 61806-2RS-FAG deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61806-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61800 compare with other series at the same 30 mm bore?",
        "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the FAG suffix for a sealed 61806?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61806-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×42×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61806-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806-2RS",
      "61806-2rs",
      "61806-2RSR",
      "61806-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61806-2Z",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.45,
    "static_load_kN": 3.44,
    "limiting_speed_rpm": 20800,
    "reference_speed_rpm": 11500,
    "weight_g": 27,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61806-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61806-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.",
      "ZZ shields are non-contact: 61806-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61806-2RS for that.",
      "Do not wash 61806-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Schaeffler HR 1 lists the shielded version as 61806-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61806 at 20800 r/min mechanical limiting speed (thermal reference speed 11500 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 30 mm bore puts 61806 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.45 kN dynamic load rating (C) and 3.44 kN static (C0), 61806 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 27 g, 61806 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 4.45/3.44 kN load ratings, mass 27 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61806-2Z on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61806: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61806 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-ZZ-FAG bearing?",
        "a": "A 61806-ZZ-FAG deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61806-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61806-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61806 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61806-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 61806?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61806-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×42×7 mm ISO 15 envelope."
      },
      {
        "q": "Is 61806-2Z an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806-ZZ",
      "61806-zz",
      "61806-2Z",
      "61806-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61906",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.24,
    "static_load_kN": 5.01,
    "limiting_speed_rpm": 21700,
    "reference_speed_rpm": 11900,
    "weight_g": 51,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61906 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61906-FAG.",
      "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61906-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 30×47×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61906 units.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61906 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61906 at 21700 r/min mechanical limiting speed (thermal reference speed 11900 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 30 mm bore puts 61906 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61906 at 7.24 kN dynamic (C) and 5.01 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 51 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 7.24/5.01 kN load ratings, mass 51 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61906-FAG on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61906: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-FAG bearing?",
        "a": "A 61906-FAG deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61906 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61906 uses the same ISO 15 envelope (30×47×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61906-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61906-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61906 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 61906?",
        "a": "FAG lists the open 61906 under the bare designation 61906-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Is 61906-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906",
      "61906-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61906-2RSR",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.24,
    "static_load_kN": 5.01,
    "limiting_speed_rpm": 7600,
    "weight_g": 53,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61906-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61906-2RS-FAG.",
      "The 619xx thin section at 30 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61906-2RS-FAG runs slower and cooler-limited than the open 61906; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61906-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 61906-2RS-FAG and shows up later as two-point loaded raceway wear.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61906-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 7600 r/min mechanical limiting speed, 61906 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 30 mm bore puts 61906 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61906 at 7.24 kN dynamic (C) and 5.01 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 53 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 7.24/5.01 kN load ratings, mass 53 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61906-2RSR on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61906; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-2RS-FAG bearing?",
        "a": "A 61906-2RS-FAG deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61906-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61900 compare with other series at the same 30 mm bore?",
        "a": "619 is a thin section one step above 618: 47×9 mm with an 8.5 mm radial section at 30 mm bore; a 6206 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the FAG suffix for a sealed 61906?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61906-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×47×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61906-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906-2RS",
      "61906-2rs",
      "61906-2RSR",
      "61906-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61906-2Z",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7.24,
    "static_load_kN": 5.01,
    "limiting_speed_rpm": 18400,
    "reference_speed_rpm": 11900,
    "weight_g": 53,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 61906-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61906-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61906-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61906-ZZ-FAG.",
      "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Schaeffler HR 1 lists the shielded version as 61906-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61906 at 18400 r/min mechanical limiting speed (thermal reference speed 11900 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 30 mm bore puts 61906 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61906 at 7.24 kN dynamic (C) and 5.01 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 53 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 7.24/5.01 kN load ratings, mass 53 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61906-2Z on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61906 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-ZZ-FAG bearing?",
        "a": "A 61906-ZZ-FAG deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61906 bore code work?",
        "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61906-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 61906?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61906-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×47×9 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61906 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61906-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906-ZZ",
      "61906-zz",
      "61906-2Z",
      "61906-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16006",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16006",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11.22,
    "static_load_kN": 7.39,
    "limiting_speed_rpm": 18500,
    "reference_speed_rpm": 10000,
    "weight_g": 82,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 16006.",
      "Because the 160xx narrow section shares the 55 mm OD of the 6006 at 30 mm bore but is only 9 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "The open 16006 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×55×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16006 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16006.",
      "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 16006 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 16006 at 18500 r/min mechanical limiting speed (thermal reference speed 10000 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 30 mm bore puts 16006 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 16006 at 11.22 kN dynamic (C) and 7.39 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 82 g, 16006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×9 mm envelope of 16006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 11.22/7.39 kN load ratings, mass 82 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16006 on the 30×55×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16006 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16006 bearing?",
        "a": "A 16006 deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 9 mm width (1.181 × 2.165 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 16006 have?",
        "a": "Unless a clearance suffix says otherwise, 16006 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16006 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 16006 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 16006?",
        "a": "FAG lists the open 16006 under the bare designation 16006; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Is 16006 an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16006-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×55×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16006"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6006-C",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.5,
    "static_load_kN": 8.3,
    "limiting_speed_rpm": 20100,
    "reference_speed_rpm": 13800,
    "weight_g": 107,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6006-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6006 units.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-FAG.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6006-FAG.",
      "The open 6006 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6006 at 20100 r/min mechanical limiting speed (thermal reference speed 13800 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 30 mm bore puts 6006 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6006 at 14.5 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 107 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 14.5/8.3 kN load ratings, mass 107 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6006-C on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006-FAG bearing?",
        "a": "A 6006-FAG deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6006 bore code work?",
        "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6006 mean?",
        "a": "A bare 6006 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6006?",
        "a": "FAG lists the open 6006 under the bare designation 6006-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6006 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6006-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006",
      "6006-C",
      "6006-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6006-C-2HRS",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.5,
    "static_load_kN": 8.3,
    "limiting_speed_rpm": 10500,
    "weight_g": 113,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6006-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6006-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6006-2RS-FAG runs slower and cooler-limited than the open 6006; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6006-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6006-2RS-FAG drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6006-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 10500 r/min mechanical limiting speed, 6006 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 30 mm bore puts 6006 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6006 at 14.5 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 113 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 14.5/8.3 kN load ratings, mass 113 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6006-C-2HRS on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006-2RS-FAG bearing?",
        "a": "A 6006-2RS-FAG deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6006-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6006-2RS-FAG need?",
        "a": "6006-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6006 with a housing grease fitting instead."
      },
      {
        "q": "What is the FAG suffix for a sealed 6006?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6006-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×55×13 mm ISO 15 envelope."
      },
      {
        "q": "Is 6006-C-2HRS an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006-2RS",
      "6006-2rs",
      "6006-C-2HRS",
      "6006-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6006-C-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.5,
    "static_load_kN": 8.3,
    "limiting_speed_rpm": 17100,
    "reference_speed_rpm": 13800,
    "weight_g": 113,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6006-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6006-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6006-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6006-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6006-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-ZZ-FAG.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Schaeffler HR 1 lists the shielded version as 6006-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6006 at 17100 r/min mechanical limiting speed (thermal reference speed 13800 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 30 mm bore puts 6006 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6006 at 14.5 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 113 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 14.5/8.3 kN load ratings, mass 113 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6006-C-2Z on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006-ZZ-FAG bearing?",
        "a": "A 6006-ZZ-FAG deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6006-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6006-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6006 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6006-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6006?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6006-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×55×13 mm ISO 15 envelope."
      },
      {
        "q": "Is 6006-C-2Z an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006-ZZ",
      "6006-zz",
      "6006-C-2Z",
      "6006-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6206-C",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 22,
    "static_load_kN": 11.3,
    "limiting_speed_rpm": 17800,
    "reference_speed_rpm": 13400,
    "weight_g": 186,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6206-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6206 units.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6206-FAG.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6206 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6206 at 17800 r/min mechanical limiting speed (thermal reference speed 13400 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 30 mm bore puts 6206 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 22 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 186 g, 6206 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22/11.3 kN load ratings, mass 186 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6206-C on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6206 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-FAG bearing?",
        "a": "A 6206-FAG deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6206-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6206-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6206 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6206-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 6206?",
        "a": "FAG lists the open 6206 under the bare designation 6206-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6206 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6206-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206",
      "6206-C",
      "6206-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6206-C-2HRS",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 22,
    "static_load_kN": 11.3,
    "limiting_speed_rpm": 10200,
    "weight_g": 201,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6206-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6206-2RS-FAG.",
      "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6206-2RS-FAG runs slower and cooler-limited than the open 6206; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6206-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6206-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6206-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 10200 r/min mechanical limiting speed, 6206 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 30 mm bore puts 6206 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 22 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 201 g, 6206 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22/11.3 kN load ratings, mass 201 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6206-C-2HRS on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-2RS-FAG bearing?",
        "a": "A 6206-2RS-FAG deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6206 bore code work?",
        "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6206-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the FAG suffix for a sealed 6206?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6206-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×62×16 mm ISO 15 envelope."
      },
      {
        "q": "Is 6206-C-2HRS an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206-2RS",
      "6206-2rs",
      "6206-C-2HRS",
      "6206-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6206-C-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 22,
    "static_load_kN": 11.3,
    "limiting_speed_rpm": 15100,
    "reference_speed_rpm": 13400,
    "weight_g": 193,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6206-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6206-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6206-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6206-2RS for that.",
      "Shielded 6206-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Schaeffler HR 1 lists the shielded version as 6206-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6206 at 15100 r/min mechanical limiting speed (thermal reference speed 13400 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 30 mm bore puts 6206 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 22 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 193 g, 6206 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22/11.3 kN load ratings, mass 193 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6206-C-2Z on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6206; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-ZZ-FAG bearing?",
        "a": "A 6206-ZZ-FAG deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6206-ZZ-FAG need?",
        "a": "6206-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6206 bore code work?",
        "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG suffix for a sealed 6206?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6206-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×62×16 mm ISO 15 envelope."
      },
      {
        "q": "Is 6206-C-2Z an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206-ZZ",
      "6206-zz",
      "6206-C-2Z",
      "6206-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6306-C",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 32,
    "static_load_kN": 16.2,
    "limiting_speed_rpm": 15100,
    "reference_speed_rpm": 11500,
    "weight_g": 328,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6306 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-FAG.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "The open 6306-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6306-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6306 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6306 at 15100 r/min mechanical limiting speed (thermal reference speed 11500 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 30 mm bore puts 6306 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 32 kN dynamic load rating (C) and 16.2 kN static (C0), 6306 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 328 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/16.2 kN load ratings, mass 328 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6306-C on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6306 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-FAG bearing?",
        "a": "A 6306-FAG deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6306-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6306-FAG need?",
        "a": "The open 6306-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 6306?",
        "a": "FAG lists the open 6306 under the bare designation 6306-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6306 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6306-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306",
      "6306-C",
      "6306-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6306-C-2HRS",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 32,
    "static_load_kN": 16.2,
    "limiting_speed_rpm": 9300,
    "weight_g": 343,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6306-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6306-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6306-2RS-FAG runs slower and cooler-limited than the open 6306; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6306-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6306-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 9300 r/min mechanical limiting speed, 6306 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 30 mm bore puts 6306 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 32 kN dynamic load rating (C) and 16.2 kN static (C0), 6306 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 343 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/16.2 kN load ratings, mass 343 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6306-C-2HRS on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6306; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6306 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-2RS-FAG bearing?",
        "a": "A 6306-2RS-FAG deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6306-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6306-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6306 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6306-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6306?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6306-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×72×19 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6306 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6306-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306-2RS",
      "6306-2rs",
      "6306-C-2HRS",
      "6306-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6306-C-2Z",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 32,
    "static_load_kN": 16.2,
    "limiting_speed_rpm": 12800,
    "reference_speed_rpm": 11500,
    "weight_g": 345,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6306-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6306-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6306-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "Do not wash 6306-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6306-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 19 mm-wide ring of 6306-ZZ-FAG drags the lip and overheats it.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the shielded version as 6306-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6306 at 12800 r/min mechanical limiting speed (thermal reference speed 11500 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 30 mm bore puts 6306 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 32 kN dynamic load rating (C) and 16.2 kN static (C0), 6306 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 345 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/16.2 kN load ratings, mass 345 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6306-C-2Z on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6306: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-ZZ-FAG bearing?",
        "a": "A 6306-ZZ-FAG deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6306-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6306-ZZ-FAG need?",
        "a": "6306-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the FAG suffix for a sealed 6306?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6306-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 30×72×19 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6306-C-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306-ZZ",
      "6306-zz",
      "6306-C-2Z",
      "6306-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6406-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6406",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 42.5,
    "static_load_kN": 23.2,
    "limiting_speed_rpm": 11000,
    "reference_speed_rpm": 9500,
    "weight_g": 721,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6406-FAG.",
      "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6406-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 30×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6406-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6406-FAG.",
      "The open 6406 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 11000 r/min mechanical limiting speed (thermal reference speed 9500 r/min), 6406 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 30 mm bore puts 6406 in Schaeffler's light industrial range; the standard cage and CN clearance cover most fractional-horsepower motor and small-pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6406 at 42.5 kN dynamic (C) and 23.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 721 g, 6406 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×90×23 mm envelope of 6406 gives a D/d ratio of 3.00 and 30.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 42.5/23.2 kN load ratings, mass 721 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6406-FAG on the 30×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6406 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6406: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6406-FAG bearing?",
        "a": "A 6406-FAG deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6406 bore code work?",
        "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6406 mean?",
        "a": "A bare 6406 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6406?",
        "a": "FAG lists the open 6406 under the bare designation 6406-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6406 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6406-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6406-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6406-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6406-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6406",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=252",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6406",
      "6406-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61807",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.74,
    "static_load_kN": 3.82,
    "limiting_speed_rpm": 21600,
    "reference_speed_rpm": 9900,
    "weight_g": 32,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61807-FAG.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.",
      "Storage matters for open bearings: 61807-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61807 units.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61807-FAG-C3. No clearance suffix means normal CN clearance.",
      "The open 61807 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61807 at 21600 r/min mechanical limiting speed (thermal reference speed 9900 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 35 mm bore puts 61807 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.74 kN dynamic load rating (C) and 3.82 kN static (C0), 61807 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 32 g, 61807 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 4.74/3.82 kN load ratings, mass 32 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61807-FAG on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61807; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61807: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-FAG bearing?",
        "a": "A 61807-FAG deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61807-FAG need?",
        "a": "The open 61807-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61807 bore code work?",
        "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 61807?",
        "a": "FAG lists the open 61807 under the bare designation 61807-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61807-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807",
      "61807-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61807-2RSR",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.74,
    "static_load_kN": 3.82,
    "limiting_speed_rpm": 7000,
    "weight_g": 32,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61807-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.",
      "Contact seals add drag and heat: 61807-2RS-FAG runs slower and cooler-limited than the open 61807; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61807-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61807-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61807-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 7000 r/min mechanical limiting speed, 61807 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 35 mm bore puts 61807 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.74 kN dynamic load rating (C) and 3.82 kN static (C0), 61807 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 32 g, 61807 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 4.74/3.82 kN load ratings, mass 32 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61807-2RSR on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61807 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-2RS-FAG bearing?",
        "a": "A 61807-2RS-FAG deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61807-2RS-FAG need?",
        "a": "61807-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61807 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61807 bore code work?",
        "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG suffix for a sealed 61807?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61807-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×47×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61807-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807-2RS",
      "61807-2rs",
      "61807-2RSR",
      "61807-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61807-2Z",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.74,
    "static_load_kN": 3.82,
    "limiting_speed_rpm": 18300,
    "reference_speed_rpm": 9900,
    "weight_g": 32,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 61807-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61807-ZZ-FAG.",
      "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.",
      "ZZ shields are non-contact: 61807-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61807-2RS for that.",
      "Shielded 61807-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61807-ZZ-FAG.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Schaeffler HR 1 lists the shielded version as 61807-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61807 at 18300 r/min mechanical limiting speed (thermal reference speed 9900 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 35 mm bore puts 61807 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.74 kN dynamic load rating (C) and 3.82 kN static (C0), 61807 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 32 g, 61807 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 4.74/3.82 kN load ratings, mass 32 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61807-2Z on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61807: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-ZZ-FAG bearing?",
        "a": "A 61807-ZZ-FAG deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61807 bore code work?",
        "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61807-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 61807?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61807-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×47×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61807-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807-ZZ",
      "61807-zz",
      "61807-2Z",
      "61807-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61907",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.9,
    "static_load_kN": 7.75,
    "limiting_speed_rpm": 17800,
    "reference_speed_rpm": 10000,
    "weight_g": 76,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-FAG.",
      "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61907-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 35×55×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61907 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61907-FAG.",
      "The open 61907 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61907 at 17800 r/min mechanical limiting speed (thermal reference speed 10000 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 61907 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61907 at 10.9 kN dynamic (C) and 7.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 76 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 10.9/7.75 kN load ratings, mass 76 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61907-FAG on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61907: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-FAG bearing?",
        "a": "A 61907-FAG deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61907 bore code work?",
        "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61907 mean?",
        "a": "A bare 61907 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 61907?",
        "a": "FAG lists the open 61907 under the bare designation 61907-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Is 61907-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907",
      "61907-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61907-2RSR",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.9,
    "static_load_kN": 7.75,
    "limiting_speed_rpm": 6300,
    "weight_g": 76,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61907-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 55 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 61907-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-2RS-FAG.",
      "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61907-2RS-FAG runs slower and cooler-limited than the open 61907; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61907-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61907-2RS-FAG drags the lip and overheats it.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61907-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 6300 r/min mechanical limiting speed, 61907 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 35 mm bore puts 61907 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61907 at 10.9 kN dynamic (C) and 7.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 76 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 10.9/7.75 kN load ratings, mass 76 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61907-2RSR on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-2RS-FAG bearing?",
        "a": "A 61907-2RS-FAG deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61907-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61907-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61907 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61907-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 61907?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61907-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×55×10 mm ISO 15 envelope."
      },
      {
        "q": "Is 61907-2RSR an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907-2RS",
      "61907-2rs",
      "61907-2RSR",
      "61907-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61907-2Z",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10.9,
    "static_load_kN": 7.75,
    "limiting_speed_rpm": 15100,
    "reference_speed_rpm": 10000,
    "weight_g": 76,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61907-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 55 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61907-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61907-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61907-2RS for that.",
      "Shielded 61907-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61907-ZZ-FAG drags the lip and overheats it.",
      "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the shielded version as 61907-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61907 at 15100 r/min mechanical limiting speed (thermal reference speed 10000 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 61907 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61907 at 10.9 kN dynamic (C) and 7.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 76 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 10.9/7.75 kN load ratings, mass 76 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61907-2Z on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61907; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-ZZ-FAG bearing?",
        "a": "A 61907-ZZ-FAG deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61907 bore code work?",
        "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61907-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 61907?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61907-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×55×10 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61907 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61907-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907-ZZ",
      "61907-zz",
      "61907-2Z",
      "61907-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16007",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16007",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12.26,
    "static_load_kN": 8.8,
    "limiting_speed_rpm": 16700,
    "reference_speed_rpm": 8900,
    "weight_g": 107,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 35 mm shaft for 16007 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 160xx narrow section at 35 mm bore shares the 62 mm outside diameter of the 6007 but is only 9 mm wide; a 6007 in a 9 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "The open 16007 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16007 units.",
      "Never mix components between two 16007 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 16007 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 16007 at 16700 r/min mechanical limiting speed (thermal reference speed 8900 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 16007 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 16007 at 12.26 kN dynamic (C) and 8.8 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 107 g, 16007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×9 mm envelope of 16007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 12.26/8.8 kN load ratings, mass 107 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16007 on the 35×62×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16007 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 16007 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16007 bearing?",
        "a": "A 16007 deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 9 mm width (1.378 × 2.441 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 16007 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 16007 uses the same ISO 15 envelope (35×62×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 16007 have?",
        "a": "Unless a clearance suffix says otherwise, 16007 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16007 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 16007?",
        "a": "FAG lists the open 16007 under the bare designation 16007; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 16007."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16007-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16007"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6007-C",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 10.3,
    "limiting_speed_rpm": 17700,
    "reference_speed_rpm": 12600,
    "weight_g": 140,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6007 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6007-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6007-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 35×62×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6007-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6007 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6007 at 17700 r/min mechanical limiting speed (thermal reference speed 12600 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 6007 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 17.5 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 140 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 17.5/10.3 kN load ratings, mass 140 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6007-C on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6007: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-FAG bearing?",
        "a": "A 6007-FAG deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6007 bore code work?",
        "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6007 mean?",
        "a": "A bare 6007 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6007?",
        "a": "FAG lists the open 6007 under the bare designation 6007-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6007 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6007-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007",
      "6007-C",
      "6007-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6007-C-2HRS",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 10.3,
    "limiting_speed_rpm": 9300,
    "weight_g": 148,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6007-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6007-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6007 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6007-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6007-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6007-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 9300 r/min mechanical limiting speed, 6007 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 35 mm bore puts 6007 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 17.5 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 148 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 17.5/10.3 kN load ratings, mass 148 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6007-C-2HRS on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6007: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-2RS-FAG bearing?",
        "a": "A 6007-2RS-FAG deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6000 compare with other series at the same 35 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (62×14 mm, 13.5 mm radial section) at 35 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6007 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6007 uses the same ISO 15 envelope (35×62×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6007?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6007-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×62×14 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6007 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6007-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007-2RS",
      "6007-2rs",
      "6007-C-2HRS",
      "6007-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6007-C-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 10.3,
    "limiting_speed_rpm": 15000,
    "reference_speed_rpm": 12600,
    "weight_g": 148,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6007-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6007-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007-ZZ-FAG.",
      "The 60xx extra-light section at 35 mm bore uses a smaller 62 mm OD than a 6207; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6007-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6007-2RS for that.",
      "Shielded 6007-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Never mix components between two 6007-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the shielded version as 6007-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6007 at 15000 r/min mechanical limiting speed (thermal reference speed 12600 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 6007 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 17.5 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 148 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 17.5/10.3 kN load ratings, mass 148 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6007-C-2Z on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-ZZ-FAG bearing?",
        "a": "A 6007-ZZ-FAG deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6007 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6007 uses the same ISO 15 envelope (35×62×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6007-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6007-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6007 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6007?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6007-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×62×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6007-C-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007-ZZ",
      "6007-zz",
      "6007-C-2Z",
      "6007-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6207-C",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 28,
    "static_load_kN": 15.4,
    "limiting_speed_rpm": 15000,
    "reference_speed_rpm": 11300,
    "weight_g": 291,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6207 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.",
      "The open 6207-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6207-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 6207-FAG and shows up later as two-point loaded raceway wear.",
      "The open 6207 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6207 at 15000 r/min mechanical limiting speed (thermal reference speed 11300 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 6207 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 28 kN dynamic load rating (C) and 15.4 kN static (C0), 6207 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 291 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28/15.4 kN load ratings, mass 291 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6207-C on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6207; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-FAG bearing?",
        "a": "A 6207-FAG deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6207 mean?",
        "a": "A bare 6207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 35 mm bore?",
        "a": "The '2' is the light diameter series: 72×17 mm with an 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated."
      },
      {
        "q": "What is the FAG order number for an open 6207?",
        "a": "FAG lists the open 6207 under the bare designation 6207-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Is 6207-C an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207",
      "6207-C",
      "6207-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6207-C-2HRS",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 28,
    "static_load_kN": 15.4,
    "limiting_speed_rpm": 8600,
    "weight_g": 280,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6207-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.",
      "Contact seals add drag and heat: 6207-2RS-FAG runs slower and cooler-limited than the open 6207; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6207-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6207-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6207-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 8600 r/min mechanical limiting speed, 6207 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 35 mm bore puts 6207 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 28 kN dynamic load rating (C) and 15.4 kN static (C0), 6207 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 280 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28/15.4 kN load ratings, mass 280 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6207-C-2HRS on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6207: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6207 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-2RS-FAG bearing?",
        "a": "A 6207-2RS-FAG deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6207-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6207-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6207 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6207-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6207?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6207-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×72×17 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6207 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6207-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207-2RS",
      "6207-2rs",
      "6207-C-2HRS",
      "6207-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6207-C-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 28,
    "static_load_kN": 15.4,
    "limiting_speed_rpm": 12700,
    "reference_speed_rpm": 11300,
    "weight_g": 274,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6207-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6207 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6207-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6207-2RS for that.",
      "Do not wash 6207-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-ZZ-FAG-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 17 mm-wide ring of 6207-ZZ-FAG drags the lip and overheats it.",
      "Schaeffler HR 1 lists the shielded version as 6207-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6207 at 12700 r/min mechanical limiting speed (thermal reference speed 11300 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 6207 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 28 kN dynamic load rating (C) and 15.4 kN static (C0), 6207 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 274 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28/15.4 kN load ratings, mass 274 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6207-C-2Z on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6207 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-ZZ-FAG bearing?",
        "a": "A 6207-ZZ-FAG deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6207 bore code work?",
        "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6207-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 6207?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6207-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×72×17 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6207 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6207-C-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207-ZZ",
      "6207-zz",
      "6207-C-2Z",
      "6207-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6307-C",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 37,
    "static_load_kN": 19.1,
    "limiting_speed_rpm": 13600,
    "reference_speed_rpm": 10900,
    "weight_g": 471,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6307 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 80 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6307 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6307-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6307 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6307-FAG.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6307-FAG-C3. No clearance suffix means normal CN clearance.",
      "The open 6307 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6307 at 13600 r/min mechanical limiting speed (thermal reference speed 10900 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 35 mm bore puts 6307 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6307 at 37 kN dynamic (C) and 19.1 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 471 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 37/19.1 kN load ratings, mass 471 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6307-C on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6307; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6307: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-FAG bearing?",
        "a": "A 6307-FAG deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6307-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6307-FAG need?",
        "a": "The open 6307-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 6307?",
        "a": "FAG lists the open 6307 under the bare designation 6307-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6307 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6307-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307",
      "6307-C",
      "6307-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6307-C-2HRS",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 37,
    "static_load_kN": 19.1,
    "limiting_speed_rpm": 8300,
    "weight_g": 490,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6307-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6307-2RS-FAG runs slower and cooler-limited than the open 6307; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6307-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6307-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 8300 r/min mechanical limiting speed, 6307 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 35 mm bore puts 6307 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6307 at 37 kN dynamic (C) and 19.1 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 490 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 37/19.1 kN load ratings, mass 490 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6307-C-2HRS on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6307 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-2RS-FAG bearing?",
        "a": "A 6307-2RS-FAG deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6307 bore code work?",
        "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6307-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the FAG suffix for a sealed 6307?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6307-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×80×21 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6307 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6307-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307-2RS",
      "6307-2rs",
      "6307-C-2HRS",
      "6307-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6307-C-2Z",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 37,
    "static_load_kN": 19.1,
    "limiting_speed_rpm": 11500,
    "reference_speed_rpm": 10900,
    "weight_g": 488,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6307-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 80 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6307-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6307-ZZ-FAG.",
      "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.",
      "ZZ shields are non-contact: 6307-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6307-2RS for that.",
      "Do not wash 6307-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 6307-ZZ-FAG and shows up later as two-point loaded raceway wear.",
      "Never mix components between two 6307-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the shielded version as 6307-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "At 11500 r/min mechanical limiting speed (thermal reference speed 10900 r/min), 6307 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 35 mm bore puts 6307 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6307 at 37 kN dynamic (C) and 19.1 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 488 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 37/19.1 kN load ratings, mass 488 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6307-C-2Z on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6307; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6307 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-ZZ-FAG bearing?",
        "a": "A 6307-ZZ-FAG deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6307 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6307-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6307-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6307?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6307-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 35×80×21 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6307 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6307-C-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307-ZZ",
      "6307-zz",
      "6307-C-2Z",
      "6307-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6407-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6407",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 56,
    "static_load_kN": 31.5,
    "limiting_speed_rpm": 9500,
    "reference_speed_rpm": 7900,
    "weight_g": 960,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (diameter series 4 of ISO 15) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6407 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Storage matters for open bearings: 6407-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6407 units.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6407-FAG.",
      "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6407-FAG and shows up later as two-point loaded raceway wear.",
      "The open 6407 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 9500 r/min mechanical limiting speed (thermal reference speed 7900 r/min), 6407 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 35 mm bore puts 6407 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6407 at 56 kN dynamic (C) and 31.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 960 g, 6407 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×100×25 mm envelope of 6407 gives a D/d ratio of 2.86 and 32.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 56/31.5 kN load ratings, mass 960 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6407-FAG on the 35×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6407 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6407 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6407-FAG bearing?",
        "a": "A 6407-FAG deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6400 compare with other series at the same 35 mm bore?",
        "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6407 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6407 uses the same ISO 15 envelope (35×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 6407?",
        "a": "FAG lists the open 6407 under the bare designation 6407-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6407-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6407-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6407-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6407-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6407",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=254",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6407",
      "6407-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61808",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.93,
    "static_load_kN": 4.18,
    "limiting_speed_rpm": 19300,
    "reference_speed_rpm": 8600,
    "weight_g": 35,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "The open 61808-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 40×52×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61808 units.",
      "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Never mix components between two 61808-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 61808 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61808 at 19300 r/min mechanical limiting speed (thermal reference speed 8600 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.",
      "The 40 mm bore puts 61808 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.93 kN dynamic load rating (C) and 4.18 kN static (C0), 61808 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 35 g, 61808 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 4.93/4.18 kN load ratings, mass 35 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61808-FAG on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61808 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-FAG bearing?",
        "a": "A 61808-FAG deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61808 bore code work?",
        "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61808 mean?",
        "a": "A bare 61808 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 61808?",
        "a": "FAG lists the open 61808 under the bare designation 61808-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61808-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808",
      "61808-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61808-2RSR",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.93,
    "static_load_kN": 4.18,
    "limiting_speed_rpm": 6200,
    "weight_g": 35,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61808-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61808-2RS-FAG.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "Contact seals add drag and heat: 61808-2RS-FAG runs slower and cooler-limited than the open 61808; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61808-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 61808-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61808-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 6200 r/min mechanical limiting speed, 61808 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 40 mm bore puts 61808 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.93 kN dynamic load rating (C) and 4.18 kN static (C0), 61808 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "At only 35 g, 61808 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 4.93/4.18 kN load ratings, mass 35 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61808-2RSR on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-2RS-FAG bearing?",
        "a": "A 61808-2RS-FAG deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61808 bore code work?",
        "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61808-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the FAG suffix for a sealed 61808?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61808-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×52×7 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61808 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61808-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808-2RS",
      "61808-2rs",
      "61808-2RSR",
      "61808-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61808-2Z",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4.93,
    "static_load_kN": 4.18,
    "limiting_speed_rpm": 16400,
    "reference_speed_rpm": 8600,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "61808-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 52 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61808-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "A 40 mm shaft for 61808 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "ZZ shields are non-contact: 61808-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61808-2RS for that.",
      "Shielded 61808-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61808-ZZ-FAG drags the lip and overheats it.",
      "Schaeffler HR 1 lists the shielded version as 61808-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 61808 at 16400 r/min mechanical limiting speed (thermal reference speed 8600 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 40 mm bore puts 61808 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 4.93 kN dynamic load rating (C) and 4.18 kN static (C0), 61808 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 4.93/4.18 kN load ratings here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61808-2Z on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61808; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-ZZ-FAG bearing?",
        "a": "A 61808-ZZ-FAG deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61808 bore code work?",
        "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61808-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 61808?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61808-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×52×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61808-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808-ZZ",
      "61808-zz",
      "61808-2Z",
      "61808-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61908-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61908",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 62,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.5,
    "static_load_kN": 9.9,
    "limiting_speed_rpm": 15800,
    "reference_speed_rpm": 10000,
    "weight_g": 115,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61908 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 62 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 40 mm shaft for 61908 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61908-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 40×62×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61908-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61908-FAG.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61908 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61908 at 15800 r/min mechanical limiting speed (thermal reference speed 10000 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 40 mm bore puts 61908 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61908 at 14.5 kN dynamic (C) and 9.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 115 g, 61908 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×62×12 mm envelope of 61908 gives a D/d ratio of 1.55 and 11.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 14.5/9.9 kN load ratings, mass 115 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61908-FAG on the 40×62×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61908 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61908 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61908-FAG bearing?",
        "a": "A 61908-FAG deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61908-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61908-FAG need?",
        "a": "The open 61908-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 61908?",
        "a": "FAG lists the open 61908 under the bare designation 61908-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61908-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61908-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61908",
      "61908-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61908-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61908-2RSR",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 62,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14.5,
    "static_load_kN": 9.9,
    "limiting_speed_rpm": 5700,
    "weight_g": 110,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61908-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 62 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 61908-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 40 mm shaft for 61908 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61908-2RS-FAG runs slower and cooler-limited than the open 61908; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61908-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 61908-2RS-FAG and shows up later as two-point loaded raceway wear.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61908-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 5700 r/min mechanical limiting speed, 61908 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 40 mm bore puts 61908 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 61908 at 14.5 kN dynamic (C) and 9.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 110 g, 61908 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×62×12 mm envelope of 61908 gives a D/d ratio of 1.55 and 11.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 14.5/9.9 kN load ratings, mass 110 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61908-2RSR on the 40×62×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61908 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61908-2RS-FAG bearing?",
        "a": "A 61908-2RS-FAG deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61900 compare with other series at the same 40 mm bore?",
        "a": "619 is a thin section one step above 618: 62×12 mm with an 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61908 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61908 uses the same ISO 15 envelope (40×62×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 61908?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61908-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×62×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61908-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61908-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61908-2RS",
      "61908-2rs",
      "61908-2RSR",
      "61908-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16008",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16008",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12.62,
    "static_load_kN": 9.65,
    "limiting_speed_rpm": 15200,
    "reference_speed_rpm": 7800,
    "weight_g": 127,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 40 mm shaft for 16008 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Because the 160xx narrow section shares the 68 mm OD of the 6008 at 40 mm bore but is only 9 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "The open 16008 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 16008 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 16008 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 16008 at 15200 r/min mechanical limiting speed (thermal reference speed 7800 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 40 mm bore puts 16008 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 16008 at 12.62 kN dynamic (C) and 9.65 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.",
      "At 127 g, 16008 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×68×9 mm envelope of 16008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 12.62/9.65 kN load ratings, mass 127 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16008 on the 40×68×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16008 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 16008: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16008 bearing?",
        "a": "A 16008 deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 9 mm width (1.575 × 2.677 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 16008 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 16008 need?",
        "a": "The open 16008 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 16008?",
        "a": "FAG lists the open 16008 under the bare designation 16008; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Does FAG offer 16008 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16008 for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16008-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16008"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6008",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.8,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 14600,
    "reference_speed_rpm": 10600,
    "weight_g": 192,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6008 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.",
      "The open 6008-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6008 units.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6008 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6008 at 14600 r/min mechanical limiting speed (thermal reference speed 10600 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 40 mm bore puts 6008 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 17.8 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 192 g, 6008 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 17.8/11.5 kN load ratings, mass 192 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6008-FAG on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6008; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-FAG bearing?",
        "a": "A 6008-FAG deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6008-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6008-FAG need?",
        "a": "The open 6008-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 6008?",
        "a": "FAG lists the open 6008 under the bare designation 6008-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6008 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6008-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008",
      "6008-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6008-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.8,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 5400,
    "weight_g": 202,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6008-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-2RS-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6008-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6008-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 68 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6008-2RS-FAG.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6008-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 5400 r/min mechanical limiting speed, 6008 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 40 mm bore puts 6008 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 17.8 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 202 g, 6008 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 17.8/11.5 kN load ratings, mass 202 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6008-2RSR on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6008; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-2RS-FAG bearing?",
        "a": "A 6008-2RS-FAG deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6008-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6008-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6008 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6008-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6008?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6008-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×68×15 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6008 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6008-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008-2RS",
      "6008-2rs",
      "6008-2RSR",
      "6008-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6008-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.8,
    "static_load_kN": 11.5,
    "limiting_speed_rpm": 12400,
    "reference_speed_rpm": 10600,
    "weight_g": 200,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6008-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6008-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6008 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6008-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6008-2RS for that.",
      "Shielded 6008-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6008-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Schaeffler HR 1 lists the shielded version as 6008-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG rates 6008 at 12400 r/min mechanical limiting speed (thermal reference speed 10600 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 40 mm bore puts 6008 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 17.8 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 200 g, 6008 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 17.8/11.5 kN load ratings, mass 200 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6008-2Z on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6008 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6008: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-ZZ-FAG bearing?",
        "a": "A 6008-ZZ-FAG deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6008 bore code work?",
        "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6008-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 6008?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6008-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×68×15 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6008-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008-ZZ",
      "6008-zz",
      "6008-2Z",
      "6008-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6208-C",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 31.5,
    "static_load_kN": 17.8,
    "limiting_speed_rpm": 13600,
    "reference_speed_rpm": 10500,
    "weight_g": 347,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6208 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 80 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6208 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6208-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6208 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6208-FAG drags the lip and overheats it.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6208 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 6208 at 13600 r/min mechanical limiting speed (thermal reference speed 10500 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "The 40 mm bore puts 6208 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 31.5 kN dynamic load rating (C) and 17.8 kN static (C0), 6208 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 347 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 31.5/17.8 kN load ratings, mass 347 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6208-C on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6208 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-FAG bearing?",
        "a": "A 6208-FAG deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6208-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6208-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6208 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6208-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 6208?",
        "a": "FAG lists the open 6208 under the bare designation 6208-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Is 6208-C an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208",
      "6208-C",
      "6208-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6208-C-2HRS",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 31.5,
    "static_load_kN": 17.8,
    "limiting_speed_rpm": 7800,
    "weight_g": 365,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6208-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 80 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6208-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6208 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.",
      "Contact seals add drag and heat: 6208-2RS-FAG runs slower and cooler-limited than the open 6208; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6208-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6208-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6208-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 7800 r/min mechanical limiting speed, 6208 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 40 mm bore puts 6208 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 31.5 kN dynamic load rating (C) and 17.8 kN static (C0), 6208 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 365 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 31.5/17.8 kN load ratings, mass 365 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6208-C-2HRS on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-2RS-FAG bearing?",
        "a": "A 6208-2RS-FAG deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6208-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6200 compare with other series at the same 40 mm bore?",
        "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated."
      },
      {
        "q": "What is the FAG suffix for a sealed 6208?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6208-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×80×18 mm ISO 15 envelope."
      },
      {
        "q": "Is 6208-C-2HRS an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208-2RS",
      "6208-2rs",
      "6208-C-2HRS",
      "6208-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6208-C-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 31.5,
    "static_load_kN": 17.8,
    "limiting_speed_rpm": 11600,
    "reference_speed_rpm": 10500,
    "weight_g": 362,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6208-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 80 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6208-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-ZZ-FAG; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6208-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6208-2RS for that.",
      "Shielded 6208-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Schaeffler HR 1 lists the shielded version as 6208-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "At 11600 r/min mechanical limiting speed (thermal reference speed 10500 r/min), 6208 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 40 mm bore puts 6208 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "At 31.5 kN dynamic load rating (C) and 17.8 kN static (C0), 6208 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 362 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 31.5/17.8 kN load ratings, mass 362 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6208-C-2Z on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6208; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6208 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-ZZ-FAG bearing?",
        "a": "A 6208-ZZ-FAG deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6208 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6208 uses the same ISO 15 envelope (40×80×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6208-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6208-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6208 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6208?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6208-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×80×18 mm ISO 15 envelope."
      },
      {
        "q": "Is 6208-C-2Z an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208-ZZ",
      "6208-zz",
      "6208-C-2Z",
      "6208-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6308-C",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 47,
    "static_load_kN": 25,
    "limiting_speed_rpm": 11800,
    "reference_speed_rpm": 9900,
    "weight_g": 596,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.",
      "The open 6308-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.",
      "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308-FAG and shows up later as two-point loaded raceway wear.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6308 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 11800 r/min mechanical limiting speed (thermal reference speed 9900 r/min), 6308 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 40 mm bore puts 6308 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6308 at 47 kN dynamic (C) and 25 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 596 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 47/25 kN load ratings, mass 596 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6308-C on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6308: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-FAG bearing?",
        "a": "A 6308-FAG deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6308 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6308-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6308-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6308 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 6308?",
        "a": "FAG lists the open 6308 under the bare designation 6308-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6308-C."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308",
      "6308-C",
      "6308-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6308-C-2HRS",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 47,
    "static_load_kN": 25,
    "limiting_speed_rpm": 7400,
    "weight_g": 654,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6308-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 90 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6308-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6308-2RS-FAG.",
      "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.",
      "Contact seals add drag and heat: 6308-2RS-FAG runs slower and cooler-limited than the open 6308; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6308-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6308-2RS-FAG drags the lip and overheats it.",
      "Never mix components between two 6308-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6308-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 7400 r/min mechanical limiting speed, 6308 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "The 40 mm bore puts 6308 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6308 at 47 kN dynamic (C) and 25 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 654 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 47/25 kN load ratings, mass 654 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6308-C-2HRS on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6308 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-2RS-FAG bearing?",
        "a": "A 6308-2RS-FAG deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6300 compare with other series at the same 40 mm bore?",
        "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6308 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6308?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6308-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×90×23 mm ISO 15 envelope."
      },
      {
        "q": "Is 6308-C-2HRS an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308-2RS",
      "6308-2rs",
      "6308-C-2HRS",
      "6308-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6308-C-2Z",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 47,
    "static_load_kN": 25,
    "limiting_speed_rpm": 10100,
    "reference_speed_rpm": 9900,
    "weight_g": 665,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6308-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 90 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6308-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.",
      "Do not wash 6308-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6308-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6308-ZZ-FAG-C3. No clearance suffix means normal CN clearance.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the shielded version as 6308-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "At 10100 r/min mechanical limiting speed (thermal reference speed 9900 r/min), 6308 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 40 mm bore puts 6308 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6308 at 47 kN dynamic (C) and 25 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 665 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 47/25 kN load ratings, mass 665 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6308-C-2Z on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-ZZ-FAG bearing?",
        "a": "A 6308-ZZ-FAG deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6308-ZZ-FAG need?",
        "a": "6308-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6308 bore code work?",
        "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG suffix for a sealed 6308?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6308-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 40×90×23 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6308-C-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308-ZZ",
      "6308-zz",
      "6308-C-2Z",
      "6308-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6408-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6408-C",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 68,
    "static_load_kN": 38,
    "limiting_speed_rpm": 9500,
    "reference_speed_rpm": 7700,
    "weight_g": 1220,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6408 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6408-FAG.",
      "The 64xx heavy section at 40 mm bore exists for high radial load at moderate rpm; its 110 mm OD and 27 mm width demand a larger housing, and grease life at motor speeds is short — treat it as a low-speed, high-load choice.",
      "Storage matters for open bearings: 6408-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6408 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6408-FAG.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6408 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 9500 r/min mechanical limiting speed (thermal reference speed 7700 r/min), 6408 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "The 40 mm bore puts 6408 in Schaeffler's general-purpose industrial range; the standard cage and CN clearance cover most electric-motor and pump duty, and FAG's X-life generation of these sizes carries higher ratings than legacy HR 1 printings — check the current eKatalog listing before reordering.",
      "FAG rates 6408 at 68 kN dynamic (C) and 38 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 1220 g (1.2 kg), 6408 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 40×110×27 mm envelope of 6408 gives a D/d ratio of 2.75 and 35.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 68/38 kN load ratings, mass 1220 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6408-C on the 40×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6408 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6408-FAG bearing?",
        "a": "A 6408-FAG deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6408 bore code work?",
        "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6408 mean?",
        "a": "A bare 6408 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6408?",
        "a": "FAG lists the open 6408 under the bare designation 6408-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6408 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6408-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6408-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6408-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6408-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6408",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=256",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6408",
      "6408-C",
      "6408-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61911",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.7,
    "static_load_kN": 14.1,
    "limiting_speed_rpm": 12100,
    "reference_speed_rpm": 7500,
    "weight_g": 180,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61911 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 80 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.",
      "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Storage matters for open bearings: 61911-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61911 units.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61911-FAG.",
      "The open 61911 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG rates 61911 at 12100 r/min mechanical limiting speed (thermal reference speed 7500 r/min) — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.",
      "At 55 mm bore 61911 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 17.7 kN dynamic load rating (C) and 14.1 kN static (C0), 61911 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 17.7/14.1 kN load ratings, mass 180 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61911-FAG on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61911; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-FAG bearing?",
        "a": "A 61911-FAG deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 55 mm bore?",
        "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61911 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 61911?",
        "a": "FAG lists the open 61911 under the bare designation 61911-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61911-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911",
      "61911-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61911-2RSR",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.7,
    "static_load_kN": 14.1,
    "limiting_speed_rpm": 4250,
    "weight_g": 180,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61911-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61911 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61911-2RS-FAG runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61911-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 61911-2RS-FAG and shows up later as two-point loaded raceway wear.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 61911-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at 4250 r/min for 61911; the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "At 55 mm bore 61911 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 17.7 kN dynamic load rating (C) and 14.1 kN static (C0), 61911 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 17.7/14.1 kN load ratings, mass 180 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61911-2RSR on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61911 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-2RS-FAG bearing?",
        "a": "A 61911-2RS-FAG deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61911-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61900 compare with other series at the same 55 mm bore?",
        "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the FAG suffix for a sealed 61911?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61911-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×80×13 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 61911 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61911-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911-2RS",
      "61911-2rs",
      "61911-2RSR",
      "61911-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-RSR-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61911-2RZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17.7,
    "static_load_kN": 14.1,
    "limiting_speed_rpm": 10300,
    "reference_speed_rpm": 7500,
    "weight_g": 180,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues this non-contact rubber-sealed version as 61911-2RZ (FAG suffix 2RZ), mapped here from the industry-neutral -RSR spelling; it is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.",
      "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61911-RSR-FAG barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61911-RSR-FAG does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 61911-RSR-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Schaeffler HR 1 lists this non-contact rubber-sealed version as 61911-2RZ (FAG suffix 2RZ), mapped here from the industry-neutral -RSR spelling. 2RZ keeps dust out with minimal friction but is not liquid-tight — for wet or washdown duty step up to the 2RSR lip-contact seal (industry-neutral -2RS).",
      "At 10300 r/min mechanical limiting speed (thermal reference speed 7500 r/min), 61911 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 61911 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 17.7 kN dynamic load rating (C) and 14.1 kN static (C0), 61911 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 180 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 17.7/14.1 kN load ratings, mass 180 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61911-2RZ on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61911; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61911 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-RSR-FAG bearing?",
        "a": "A 61911-RSR-FAG deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61900 compare with other series at the same 55 mm bore?",
        "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61911 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 61911?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61911-2RZ), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×80×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61911-2RZ."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911-RSR",
      "61911-rsr",
      "61911-2RZ",
      "61911-RSR-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16011",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16011",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 19.3,
    "static_load_kN": 16.3,
    "limiting_speed_rpm": 10900,
    "reference_speed_rpm": 6000,
    "weight_g": 260,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 16011 with C3 clearance and re-check the residual value after mounting.",
      "Because the 160xx narrow section shares the 90 mm OD of the 6011 at 55 mm bore but is only 11 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "The open 16011 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 16011 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 16011 drags the lip and overheats it.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 16011-C3. No clearance suffix means normal CN clearance.",
      "The open 16011 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 10900 r/min mechanical limiting speed (thermal reference speed 6000 r/min), 16011 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 16011 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 19.3 kN dynamic load rating (C) and 16.3 kN static (C0), 16011 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 260 g, 16011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×11 mm envelope of 16011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 19.3/16.3 kN load ratings, mass 260 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16011 on the 55×90×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16011 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 16011: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 16011; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16011 bearing?",
        "a": "A 16011 deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 11 mm width (2.165 × 3.543 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 16011 mean?",
        "a": "A bare 16011 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 16000 compare with other series at the same 55 mm bore?",
        "a": "160 is the narrow extra-light section: 90×11 mm with a 17.5 mm radial section at 55 mm bore. It has the same bore and outside diameter as the 6011 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site."
      },
      {
        "q": "What is the FAG order number for an open 16011?",
        "a": "FAG lists the open 16011 under the bare designation 16011; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Is 16011 an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16011-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16011"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6011",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 30,
    "static_load_kN": 21.2,
    "limiting_speed_rpm": 10700,
    "reference_speed_rpm": 8300,
    "weight_g": 397,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6011 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6011-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6011-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6011-FAG.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6011-FAG-C3. No clearance suffix means normal CN clearance.",
      "The open 6011 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 10700 r/min mechanical limiting speed (thermal reference speed 8300 r/min), 6011 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 6011 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 30 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 397 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 30/21.2 kN load ratings, mass 397 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6011-FAG on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6011 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-FAG bearing?",
        "a": "A 6011-FAG deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6011-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6011-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6011 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6011-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 6011?",
        "a": "FAG lists the open 6011 under the bare designation 6011-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6011-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011",
      "6011-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6011-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 30,
    "static_load_kN": 21.2,
    "limiting_speed_rpm": 4050,
    "weight_g": 397,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6011-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6011-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6011 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6011-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6011-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6011-2RS-FAG.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6011-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6011-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at 4050 r/min for 6011; the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "At 55 mm bore 6011 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 30 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 397 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 30/21.2 kN load ratings, mass 397 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6011-2RSR on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6011; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-2RS-FAG bearing?",
        "a": "A 6011-2RS-FAG deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6011-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 55 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the FAG suffix for a sealed 6011?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6011-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×90×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6011-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011-2RS",
      "6011-2rs",
      "6011-2RSR",
      "6011-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6011-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 30,
    "static_load_kN": 21.2,
    "limiting_speed_rpm": 9100,
    "reference_speed_rpm": 8300,
    "weight_g": 409,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6011-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6011 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6011-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6011-2RS for that.",
      "Do not wash 6011-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6011-ZZ-FAG and shows up later as two-point loaded raceway wear.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Schaeffler HR 1 lists the shielded version as 6011-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "At 9100 r/min mechanical limiting speed (thermal reference speed 8300 r/min), 6011 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 6011 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 30 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.",
      "At 409 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 30/21.2 kN load ratings, mass 409 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6011-2Z on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-ZZ-FAG bearing?",
        "a": "A 6011-ZZ-FAG deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 55 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6011 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6011 uses the same ISO 15 envelope (55×90×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6011?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6011-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×90×18 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6011 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6011-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011-ZZ",
      "6011-zz",
      "6011-2Z",
      "6011-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6211-C",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 29,
    "limiting_speed_rpm": 10400,
    "reference_speed_rpm": 8300,
    "weight_g": 580,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6211 with C3 clearance and re-check the residual value after mounting.",
      "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.",
      "The open 6211-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6211 units.",
      "Never mix components between two 6211-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211-FAG drags the lip and overheats it.",
      "The open 6211 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 10400 r/min mechanical limiting speed (thermal reference speed 8300 r/min), 6211 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 6211 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "FAG rates 6211 at 46.5 kN dynamic (C) and 29 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 580 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 46.5/29 kN load ratings, mass 580 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6211-C on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6211; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-FAG bearing?",
        "a": "A 6211-FAG deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 55 mm bore?",
        "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated."
      },
      {
        "q": "Are 6211 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 6211?",
        "a": "FAG lists the open 6211 under the bare designation 6211-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Is 6211-C an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211",
      "6211-C",
      "6211-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6211-C-2HRS",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 29,
    "limiting_speed_rpm": 5800,
    "weight_g": 600,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6211-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 55 mm bore; before upgrading to a 6311 for extra capacity, confirm the housing accepts a 100 mm OD and 21 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6211-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6211-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6211-2RS-FAG-C3. No clearance suffix means normal CN clearance.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6211-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 5800 r/min mechanical limiting speed, 6211 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "At 55 mm bore 6211 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "FAG rates 6211 at 46.5 kN dynamic (C) and 29 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 600 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 46.5/29 kN load ratings, mass 600 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6211-C-2HRS on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6211 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6211: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-2RS-FAG bearing?",
        "a": "A 6211-2RS-FAG deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6211 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6211 uses the same ISO 15 envelope (55×100×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6211-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6211-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6211 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6211?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6211-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×100×21 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6211-C-2HRS."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211-2RS",
      "6211-2rs",
      "6211-C-2HRS",
      "6211-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6211-C-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 29,
    "limiting_speed_rpm": 8800,
    "reference_speed_rpm": 8300,
    "weight_g": 580,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6211-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.",
      "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Do not wash 6211-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6211-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Schaeffler HR 1 lists the shielded version as 6211-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "At 8800 r/min mechanical limiting speed (thermal reference speed 8300 r/min), 6211 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 6211 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "FAG rates 6211 at 46.5 kN dynamic (C) and 29 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 580 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 46.5/29 kN load ratings, mass 580 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6211-C-2Z on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6211: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6211; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-ZZ-FAG bearing?",
        "a": "A 6211-ZZ-FAG deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6211-ZZ-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6211-ZZ-FAG need?",
        "a": "6211-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the FAG suffix for a sealed 6211?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6211-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×100×21 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6211-C-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211-ZZ",
      "6211-zz",
      "6211-C-2Z",
      "6211-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6311-C",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 83,
    "static_load_kN": 47.5,
    "limiting_speed_rpm": 8500,
    "reference_speed_rpm": 7800,
    "weight_g": 1330,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6311 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6311-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6311-FAG.",
      "The open 6311 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 8500 r/min mechanical limiting speed (thermal reference speed 7800 r/min), 6311 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.",
      "At 55 mm bore 6311 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 83 kN dynamic load rating (C) and 47.5 kN static (C0), 6311 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 1330 g (1.3 kg), 6311 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 83/47.5 kN load ratings, mass 1330 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6311-C on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6311: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-FAG bearing?",
        "a": "A 6311-FAG deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6311 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6311-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6311-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 6311?",
        "a": "FAG lists the open 6311 under the bare designation 6311-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6311 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6311-C for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311",
      "6311-C",
      "6311-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6311-C-2HRS",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 83,
    "static_load_kN": 47.5,
    "limiting_speed_rpm": 5300,
    "weight_g": 1370,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6311-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6311-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6311-2RS-FAG runs slower and cooler-limited than the open 6311; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6311-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6311-2RS-FAG.",
      "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6311-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "At 5300 r/min mechanical limiting speed, 6311 covers medium-duty industrial drives; the 2RSR lip-contact seal is the practical speed limiter — for continuous operation near the ceiling use the open or 2RZ variant with external housing sealing.",
      "At 55 mm bore 6311 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 83 kN dynamic load rating (C) and 47.5 kN static (C0), 6311 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 83/47.5 kN load ratings, mass 1370 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6311-C-2HRS on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6311; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6311: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-2RS-FAG bearing?",
        "a": "A 6311-2RS-FAG deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6311-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6300 compare with other series at the same 55 mm bore?",
        "a": "The '3' is the medium diameter series: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 6211 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the FAG suffix for a sealed 6311?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6311-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×120×29 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6311 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6311-C-2HRS for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311-2RS",
      "6311-2rs",
      "6311-C-2HRS",
      "6311-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6311-C-2Z",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 83,
    "static_load_kN": 47.5,
    "limiting_speed_rpm": 7200,
    "reference_speed_rpm": 7800,
    "weight_g": 1370,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6311-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6311 with C3 for those conditions.",
      "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6311-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6311-2RS for that.",
      "Shielded 6311-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 29 mm-wide ring of 6311-ZZ-FAG drags the lip and overheats it.",
      "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Schaeffler HR 1 lists the shielded version as 6311-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "At 7200 r/min mechanical limiting speed (thermal reference speed 7800 r/min), 6311 covers medium-duty industrial drives; the open or shielded execution can run continuously here on standard lithium grease.",
      "At 55 mm bore 6311 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 83 kN dynamic load rating (C) and 47.5 kN static (C0), 6311 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 83/47.5 kN load ratings, mass 1370 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6311-C-2Z on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6311; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-ZZ-FAG bearing?",
        "a": "A 6311-ZZ-FAG deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6311 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6311-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6311-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6311?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6311-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 55×120×29 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6311-C-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311-ZZ",
      "6311-zz",
      "6311-C-2Z",
      "6311-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6411-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6411-C",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 101,
    "static_load_kN": 60,
    "limiting_speed_rpm": 7300,
    "reference_speed_rpm": 6500,
    "weight_g": 2320,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6411 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the heavy 64xx section (diameter series 4 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.",
      "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6411-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 55×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6411-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6411 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 7300 r/min mechanical limiting speed (thermal reference speed 6500 r/min), 6411 covers medium-duty industrial drives; the open or shielded execution can run continuously here on standard lithium grease.",
      "At 55 mm bore 6411 is in Schaeffler's upper general-purpose range; the pressed steel cage is standard but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for shock or very-low-speed duty — confirm cage material with the Schaeffler channel if the application sees impact loads.",
      "At 101 kN dynamic load rating (C) and 60 kN static (C0), 6411 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2320 g (2.3 kg), 6411 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 55×140×33 mm envelope of 6411 gives a D/d ratio of 2.55 and 42.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 101/60 kN load ratings, mass 2320 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6411-C on the 55×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6411 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6411: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6411-FAG bearing?",
        "a": "A 6411-FAG deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6411 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6411 uses the same ISO 15 envelope (55×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6411-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6411-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6411 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 6411?",
        "a": "FAG lists the open 6411 under the bare designation 6411-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6411-C."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6411-2RS",
        "equiv_brand": "GENERIC-ISO",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6411-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6411-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6411",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=262",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6411",
      "6411-C",
      "6411-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61826-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61826",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 165,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 37.7,
    "static_load_kN": 43,
    "limiting_speed_rpm": 5500,
    "reference_speed_rpm": 3600,
    "weight_g": 775,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.",
      "The open 61826-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61826-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61826 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "At 5500 r/min mechanical limiting speed (thermal reference speed 3600 r/min), 61826 covers medium-duty industrial drives; the open or shielded execution can run continuously here on standard lithium grease.",
      "The 130 mm bore places 61826 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61826 at 37.7 kN dynamic (C) and 43 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 775 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 37.7/43 kN load ratings, mass 775 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61826-FAG on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61826: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61826-FAG bearing?",
        "a": "A 61826-FAG deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61826-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61826-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61826 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61826-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61826?",
        "a": "FAG lists the open 61826 under the bare designation 61826-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61826 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61826-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61826-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-RSR-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61826",
      "61826-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16026",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16026",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 84,
    "static_load_kN": 82,
    "limiting_speed_rpm": 4650,
    "reference_speed_rpm": 3450,
    "weight_g": 2370,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Because the 160xx narrow section shares the 200 mm OD of the 6026 at 130 mm bore but is only 22 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "The open 16026 has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 16026 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 16026.",
      "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16026.",
      "The open 16026 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4650 r/min for 16026 (thermal reference speed 3450 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 130 mm bore places 16026 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 84 kN dynamic load rating (C) and 82 kN static (C0), 16026 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2370 g (2.4 kg), 16026 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 130×200×22 mm envelope of 16026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 84/82 kN load ratings, mass 2370 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16026 on the 130×200×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16026 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 16026: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 16026; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16026 bearing?",
        "a": "A 16026 deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 22 mm width (5.118 × 7.874 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 16000 compare with other series at the same 130 mm bore?",
        "a": "160 is the narrow extra-light section: 200×22 mm with a 35.0 mm radial section at 130 mm bore. It has the same bore and outside diameter as the 6026 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site."
      },
      {
        "q": "Are 16026 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 16026 uses the same ISO 15 envelope (130×200×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 16026?",
        "a": "FAG lists the open 16026 under the bare designation 16026; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does FAG offer 16026 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16026 for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16026-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16026"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6026-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6026",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 113,
    "static_load_kN": 101,
    "limiting_speed_rpm": 4500,
    "reference_speed_rpm": 4350,
    "weight_g": 3320,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6026-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 130×200×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6026 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-FAG-C3. No clearance suffix means normal CN clearance.",
      "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6026 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4500 r/min for 6026 (thermal reference speed 4350 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 130 mm bore places 6026 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 113 kN dynamic load rating (C) and 101 kN static (C0), 6026 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3320 g (3.3 kg), 6026 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 113/101 kN load ratings, mass 3320 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6026-FAG on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6026; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6026 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6026-FAG bearing?",
        "a": "A 6026-FAG deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6026-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6026-FAG need?",
        "a": "The open 6026-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 6026?",
        "a": "FAG lists the open 6026 under the bare designation 6026-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6026 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6026-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6026-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6026",
      "6026-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6026-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6026-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 113,
    "static_load_kN": 101,
    "limiting_speed_rpm": 1750,
    "weight_g": 3380,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6026-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6026-2RS-FAG runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6026-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 6026-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 6026-2RS-FAG drags the lip and overheats it.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6026-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at only 1750 r/min for 6026; this is a heavy-section size where cage inertia and centrifugal force cap rotation — do not run this size in a high-speed position, step to a smaller bearing on the same bore instead.",
      "The 130 mm bore places 6026 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 113 kN dynamic load rating (C) and 101 kN static (C0), 6026 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3380 g (3.4 kg), 6026 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 113/101 kN load ratings, mass 3380 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6026-2RSR on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6026-2RS-FAG bearing?",
        "a": "A 6026-2RS-FAG deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6026 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6026-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6026-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6026 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6026?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6026-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 130×200×33 mm ISO 15 envelope."
      },
      {
        "q": "Is 6026-2RSR an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6026-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6026-2RS",
      "6026-2rs",
      "6026-2RSR",
      "6026-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6026-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6026-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 113,
    "static_load_kN": 101,
    "limiting_speed_rpm": 3800,
    "reference_speed_rpm": 4350,
    "weight_g": 3310,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6026-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6026-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6026-2RS for that.",
      "Shielded 6026-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The housing bore for the 200 mm OD should be round within IT7; an oval bore pinches the outer ring of 6026-ZZ-FAG and shows up later as two-point loaded raceway wear.",
      "Schaeffler HR 1 lists the shielded version as 6026-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG lists the mechanical limiting speed at 3800 r/min for 6026 (thermal reference speed 4350 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 130 mm bore places 6026 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 113 kN dynamic load rating (C) and 101 kN static (C0), 6026 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3310 g (3.3 kg), 6026 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 113/101 kN load ratings, mass 3310 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6026-2Z on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6026-ZZ-FAG bearing?",
        "a": "A 6026-ZZ-FAG deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 130 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6026 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6026?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6026-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 130×200×33 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6026-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6026-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6026-ZZ",
      "6026-zz",
      "6026-2Z",
      "6026-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6226-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6226",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 177,
    "static_load_kN": 146,
    "limiting_speed_rpm": 3850,
    "reference_speed_rpm": 3900,
    "weight_g": 6110,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 130 mm of 6226-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6226-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 130×230×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6226-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6226-FAG-C3. No clearance suffix means normal CN clearance.",
      "The open 6226 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3850 r/min for 6226 (thermal reference speed 3900 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 130 mm bore places 6226 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6226 at 177 kN dynamic (C) and 146 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 6110 g (6.1 kg), 6226 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 177/146 kN load ratings, mass 6110 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6226-FAG on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6226; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6226-FAG bearing?",
        "a": "A 6226-FAG deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6226 mean?",
        "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 130 mm bore?",
        "a": "The '2' is the light diameter series: 230×40 mm with a 50.0 mm radial section at 130 mm bore. A 6326 on the same bore is larger and higher-rated; a 6026 is smaller and lower-rated."
      },
      {
        "q": "What is the FAG order number for an open 6226?",
        "a": "FAG lists the open 6226 under the bare designation 6226-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6226-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6226-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6226",
      "6226-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6226-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6226-2Z",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 177,
    "static_load_kN": 146,
    "limiting_speed_rpm": 3250,
    "reference_speed_rpm": 3900,
    "weight_g": 6120,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6226-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass is significant: heat 6226 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Do not wash 6226-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6226-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6226-ZZ-FAG.",
      "Never mix components between two 6226-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the shielded version as 6226-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG lists the mechanical limiting speed at 3250 r/min for 6226 (thermal reference speed 3900 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 130 mm bore places 6226 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6226 at 177 kN dynamic (C) and 146 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 6120 g (6.1 kg), 6226 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 177/146 kN load ratings, mass 6120 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6226-2Z on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6226-ZZ-FAG bearing?",
        "a": "A 6226-ZZ-FAG deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6226 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6226 uses the same ISO 15 envelope (130×230×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6226-ZZ-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6226-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6226 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG suffix for a sealed 6226?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6226-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 130×230×40 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6226 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6226-2Z for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6226-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6226-ZZ",
      "6226-zz",
      "6226-2Z",
      "6226-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6326-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6326",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 244,
    "static_load_kN": 214,
    "limiting_speed_rpm": 3200,
    "reference_speed_rpm": 3500,
    "weight_g": 15400,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 130 mm of 6326-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.",
      "The open 6326-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 130×280×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6326-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 280 mm OD should be round within IT7; an oval bore pinches the outer ring of 6326-FAG and shows up later as two-point loaded raceway wear.",
      "The open 6326 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3200 r/min for 6326 (thermal reference speed 3500 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 130 mm bore places 6326 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6326 at 244 kN dynamic (C) and 214 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 15400 g (15.4 kg), 6326 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×280×58 mm envelope of 6326 gives a D/d ratio of 2.15 and 75.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 244/214 kN load ratings, mass 15400 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6326-FAG on the 130×280×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6326 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6326; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6326-FAG bearing?",
        "a": "A 6326-FAG deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6326-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6326-FAG need?",
        "a": "The open 6326-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 6326?",
        "a": "FAG lists the open 6326 under the bare designation 6326-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Is 6326-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6326-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=276",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6326",
      "6326-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16028",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16028",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 86,
    "static_load_kN": 87,
    "limiting_speed_rpm": 4400,
    "reference_speed_rpm": 3200,
    "weight_g": 2540,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 16028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 160xx narrow section at 140 mm bore shares the 210 mm outside diameter of the 6028 but is only 22 mm wide; a 6028 in a 22 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "The open 16028 has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16028 units.",
      "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 16028 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4400 r/min for 16028 (thermal reference speed 3200 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 140 mm bore places 16028 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 86 kN dynamic load rating (C) and 87 kN static (C0), 16028 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2540 g (2.5 kg), 16028 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 140×210×22 mm envelope of 16028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 86/87 kN load ratings, mass 2540 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16028 on the 140×210×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16028 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 16028; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16028 bearing?",
        "a": "A 16028 deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 22 mm width (5.512 × 8.268 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 16028 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 16028 need?",
        "a": "The open 16028 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 16028?",
        "a": "FAG lists the open 16028 under the bare designation 16028; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 16028."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16028-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16028"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6028-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6028",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 117,
    "static_load_kN": 109,
    "limiting_speed_rpm": 4250,
    "reference_speed_rpm": 4050,
    "weight_g": 3510,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6028 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Storage matters for open bearings: 6028-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6028 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028-FAG.",
      "The open 6028 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4250 r/min for 6028 (thermal reference speed 4050 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 140 mm bore places 6028 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 117 kN dynamic load rating (C) and 109 kN static (C0), 6028 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3510 g (3.5 kg), 6028 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 117/109 kN load ratings, mass 3510 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6028-FAG on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6028-FAG bearing?",
        "a": "A 6028-FAG deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6028-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6028-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6028 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6028-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 6028?",
        "a": "FAG lists the open 6028 under the bare designation 6028-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6028-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6028-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6028",
      "6028-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6028-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6028-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 117,
    "static_load_kN": 109,
    "limiting_speed_rpm": 1650,
    "weight_g": 3510,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6028-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6028-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6028-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6028-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Never mix components between two 6028-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6028-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at only 1650 r/min for 6028; this is a heavy-section size where cage inertia and centrifugal force cap rotation — do not run this size in a high-speed position, step to a smaller bearing on the same bore instead.",
      "The 140 mm bore places 6028 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 117 kN dynamic load rating (C) and 109 kN static (C0), 6028 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3510 g (3.5 kg), 6028 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 117/109 kN load ratings, mass 3510 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6028-2RSR on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6028 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6028-2RS-FAG bearing?",
        "a": "A 6028-2RS-FAG deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6028 bore code work?",
        "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6028-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the FAG suffix for a sealed 6028?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6028-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 140×210×33 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6028 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6028-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6028-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6028-2RS",
      "6028-2rs",
      "6028-2RSR",
      "6028-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6028-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6028-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 117,
    "static_load_kN": 109,
    "limiting_speed_rpm": 3600,
    "reference_speed_rpm": 4050,
    "weight_g": 3490,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6028-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6028-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6028-2RS for that.",
      "Do not wash 6028-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "The housing bore for the 210 mm OD should be round within IT7; an oval bore pinches the outer ring of 6028-ZZ-FAG and shows up later as two-point loaded raceway wear.",
      "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Schaeffler HR 1 lists the shielded version as 6028-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG lists the mechanical limiting speed at 3600 r/min for 6028 (thermal reference speed 4050 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 140 mm bore places 6028 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 117 kN dynamic load rating (C) and 109 kN static (C0), 6028 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3490 g (3.5 kg), 6028 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 117/109 kN load ratings, mass 3490 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6028-2Z on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6028: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6028; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6028-ZZ-FAG bearing?",
        "a": "A 6028-ZZ-FAG deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 140 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6028 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6028 uses the same ISO 15 envelope (140×210×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6028?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6028-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 140×210×33 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6028-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6028-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6028-ZZ",
      "6028-zz",
      "6028-2Z",
      "6028-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6228-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6228",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 188,
    "static_load_kN": 165,
    "limiting_speed_rpm": 3600,
    "reference_speed_rpm": 3600,
    "weight_g": 7940,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 6228 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.",
      "The open 6228-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 140×250×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6228-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 250 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6228-FAG.",
      "The open 6228 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3600 r/min for 6228 (thermal reference speed 3600 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 140 mm bore places 6228 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6228 at 188 kN dynamic (C) and 165 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 7940 g (7.9 kg), 6228 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 188/165 kN load ratings, mass 7940 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6228-FAG on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6228; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6228-FAG bearing?",
        "a": "A 6228-FAG deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6228-FAG need?",
        "a": "The open 6228-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6228 bore code work?",
        "a": "The last two digits of 6228 are bore code 28, giving 28 × 5 = 140 mm bore. The 250 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 6228?",
        "a": "FAG lists the open 6228 under the bare designation 6228-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6228-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6228-2RS",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6228",
      "6228-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61830-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61830",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 54,
    "static_load_kN": 60,
    "limiting_speed_rpm": 4700,
    "reference_speed_rpm": 3200,
    "weight_g": 1150,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 150 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6230.",
      "The open 61830-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61830 units.",
      "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61830-FAG.",
      "The open 61830 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4700 r/min for 61830 (thermal reference speed 3200 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 150 mm bore places 61830 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61830 at 54 kN dynamic (C) and 60 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 1150 g (1.1 kg), 61830 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 54/60 kN load ratings, mass 1150 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61830-FAG on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61830-FAG bearing?",
        "a": "A 61830-FAG deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61830-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61830-FAG need?",
        "a": "The open 61830-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 61830?",
        "a": "FAG lists the open 61830 under the bare designation 61830-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61830-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61830-2RS",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61830",
      "61830-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16030",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16030",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98,
    "static_load_kN": 99,
    "limiting_speed_rpm": 4050,
    "reference_speed_rpm": 3100,
    "weight_g": 3170,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 16030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Because the 160xx narrow section shares the 225 mm OD of the 6030 at 150 mm bore but is only 24 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.",
      "Storage matters for open bearings: 16030 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16030 units.",
      "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 16030 and shows up later as two-point loaded raceway wear.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16030.",
      "The open 16030 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4050 r/min for 16030 (thermal reference speed 3100 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 150 mm bore places 16030 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 98 kN dynamic load rating (C) and 99 kN static (C0), 16030 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3170 g (3.2 kg), 16030 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 150×225×24 mm envelope of 16030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 98/99 kN load ratings, mass 3170 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16030 on the 150×225×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16030 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 16030; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 16030 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16030 bearing?",
        "a": "A 16030 deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 24 mm width (5.906 × 8.858 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 16030 have?",
        "a": "Unless a clearance suffix says otherwise, 16030 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16030 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 16030 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 16030?",
        "a": "FAG lists the open 16030 under the bare designation 16030; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "Does FAG offer 16030 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16030 for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16030-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6030",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 124,
    "limiting_speed_rpm": 3950,
    "reference_speed_rpm": 3850,
    "weight_g": 4260,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6030 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 150 mm of 6030-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.",
      "The open 6030-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6030 units.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6030-FAG.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6030-FAG drags the lip and overheats it.",
      "The open 6030 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3950 r/min for 6030 (thermal reference speed 3850 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 150 mm bore places 6030 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 124 kN static (C0), 6030 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 4260 g (4.3 kg), 6030 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 131/124 kN load ratings, mass 4260 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6030-FAG on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6030: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6030; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-FAG bearing?",
        "a": "A 6030-FAG deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6030 bore code work?",
        "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6030 mean?",
        "a": "A bare 6030 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6030?",
        "a": "FAG lists the open 6030 under the bare designation 6030-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6030-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030",
      "6030-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6030-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 124,
    "limiting_speed_rpm": 1540,
    "weight_g": 4380,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6030-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6030-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 6030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6030-2RS-FAG runs slower and cooler-limited than the open 6030; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6030-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 6030-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 225 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6030-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6030-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at only 1540 r/min for 6030; this is a heavy-section size where cage inertia and centrifugal force cap rotation — do not run this size in a high-speed position, step to a smaller bearing on the same bore instead.",
      "The 150 mm bore places 6030 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 124 kN static (C0), 6030 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 4380 g (4.4 kg), 6030 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 131/124 kN load ratings, mass 4380 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6030-2RSR on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6030; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-2RS-FAG bearing?",
        "a": "A 6030-2RS-FAG deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6030-2RS-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 6030-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6030-2RS-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG suffix for a sealed 6030?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6030-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 150×225×35 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6030-2RSR."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030-2RS",
      "6030-2rs",
      "6030-2RSR",
      "6030-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6030-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 124,
    "limiting_speed_rpm": 3350,
    "reference_speed_rpm": 3850,
    "weight_g": 4300,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6030-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 6030 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.",
      "Do not wash 6030-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6030-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6030-ZZ-FAG drags the lip and overheats it.",
      "Schaeffler HR 1 lists the shielded version as 6030-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG lists the mechanical limiting speed at 3350 r/min for 6030 (thermal reference speed 3850 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 150 mm bore places 6030 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 124 kN static (C0), 6030 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 4300 g (4.3 kg), 6030 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 131/124 kN load ratings, mass 4300 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6030-2Z on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6030 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-ZZ-FAG bearing?",
        "a": "A 6030-ZZ-FAG deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6030 bore code work?",
        "a": "The last two digits of 6030 are bore code 30, giving 30 × 5 = 150 mm bore. The 225 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6030-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the FAG suffix for a sealed 6030?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6030-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 150×225×35 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6030-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030-ZZ",
      "6030-zz",
      "6030-2Z",
      "6030-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6230-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6230",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 187,
    "static_load_kN": 168,
    "limiting_speed_rpm": 3350,
    "reference_speed_rpm": 3350,
    "weight_g": 10200,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.",
      "The open 6230-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 150×270×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6230-FAG.",
      "The open 6230 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3350 r/min for 6230 (thermal reference speed 3350 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 150 mm bore places 6230 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6230 at 187 kN dynamic (C) and 168 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 10200 g (10.2 kg), 6230 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.",
      "The 187/168 kN load ratings, mass 10200 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6230-FAG on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6230 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6230-FAG bearing?",
        "a": "A 6230-FAG deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6230-FAG need?",
        "a": "The open 6230-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6230 bore code work?",
        "a": "The last two digits of 6230 are bore code 30, giving 30 × 5 = 150 mm bore. The 270 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 6230?",
        "a": "FAG lists the open 6230 under the bare designation 6230-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "Is 6230-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6230-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6230",
      "6230-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61832-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61832",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 55,
    "static_load_kN": 62,
    "limiting_speed_rpm": 4450,
    "reference_speed_rpm": 3000,
    "weight_g": 1220,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 61832 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.",
      "Storage matters for open bearings: 61832-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61832 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61832-FAG.",
      "The open 61832 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4450 r/min for 61832 (thermal reference speed 3000 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 160 mm bore places 61832 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61832 at 55 kN dynamic (C) and 62 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 1220 g (1.2 kg), 61832 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 55/62 kN load ratings, mass 1220 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61832-FAG on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61832-FAG bearing?",
        "a": "A 61832-FAG deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61832 bore code work?",
        "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61832 mean?",
        "a": "A bare 61832 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 61832?",
        "a": "FAG lists the open 61832 under the bare designation 61832-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61832-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61832-2RS",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61832",
      "61832-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61932-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61932",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98,
    "static_load_kN": 99,
    "limiting_speed_rpm": 4050,
    "reference_speed_rpm": 3450,
    "weight_g": 2700,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61932 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 220 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61932-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61932 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 61932-FAG drags the lip and overheats it.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 220 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61932-FAG.",
      "The open 61932 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4050 r/min for 61932 (thermal reference speed 3450 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 160 mm bore places 61932 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 98 kN dynamic load rating (C) and 99 kN static (C0), 61932 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2700 g (2.7 kg), 61932 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 98/99 kN load ratings, mass 2700 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61932-FAG on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61932 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61932-FAG bearing?",
        "a": "A 61932-FAG deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61932-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61932-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61932 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61932-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61932?",
        "a": "FAG lists the open 61932 under the bare designation 61932-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61932 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61932-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61932-2RS",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61932",
      "61932-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16032",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16032",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 109,
    "static_load_kN": 114,
    "limiting_speed_rpm": 3800,
    "reference_speed_rpm": 2950,
    "weight_g": 3750,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 160 mm of 16032 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 160xx narrow section at 160 mm bore shares the 240 mm outside diameter of the 6032 but is only 25 mm wide; a 6032 in a 25 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "The open 16032 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 16032 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 16032 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 16032 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3800 r/min for 16032 (thermal reference speed 2950 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 160 mm bore places 16032 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 109 kN dynamic load rating (C) and 114 kN static (C0), 16032 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 3750 g (3.8 kg), 16032 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 160×240×25 mm envelope of 16032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 109/114 kN load ratings, mass 3750 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16032 on the 160×240×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16032 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 16032: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16032 bearing?",
        "a": "A 16032 deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 25 mm width (6.299 × 9.449 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 16032 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 16032 need?",
        "a": "The open 16032 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 16032?",
        "a": "FAG lists the open 16032 under the bare designation 16032; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "Does FAG offer 16032 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16032 for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16032-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×240×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6032-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6032",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 142,
    "static_load_kN": 136,
    "limiting_speed_rpm": 3700,
    "reference_speed_rpm": 3750,
    "weight_g": 5200,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.",
      "The open 6032-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.",
      "Never mix components between two 6032-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6032 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3700 r/min for 6032 (thermal reference speed 3750 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 160 mm bore places 6032 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6032 at 142 kN dynamic (C) and 136 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 5200 g (5.2 kg), 6032 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 142/136 kN load ratings, mass 5200 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6032-FAG on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6032; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6032 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6032-FAG bearing?",
        "a": "A 6032-FAG deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6032 bore code work?",
        "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6032 mean?",
        "a": "A bare 6032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 6032?",
        "a": "FAG lists the open 6032 under the bare designation 6032-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6032 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6032-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6032-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6032",
      "6032-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6032-2RS-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6032-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 142,
    "static_load_kN": 136,
    "limiting_speed_rpm": 1440,
    "weight_g": 5270,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6032-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6032-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 160 mm of 6032-2RS-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6032-2RS-FAG runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6032-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 6032-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6032-2RS-FAG.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6032-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at only 1440 r/min for 6032; this is a heavy-section size where cage inertia and centrifugal force cap rotation — do not run this size in a high-speed position, step to a smaller bearing on the same bore instead.",
      "The 160 mm bore places 6032 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6032 at 142 kN dynamic (C) and 136 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 5270 g (5.3 kg), 6032 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 142/136 kN load ratings, mass 5270 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6032-2RSR on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6032: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6032-2RS-FAG bearing?",
        "a": "A 6032-2RS-FAG deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6000 compare with other series at the same 160 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6032 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6032?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6032-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 160×240×38 mm ISO 15 envelope."
      },
      {
        "q": "Does FAG offer 6032 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6032-2RSR for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6032-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6032-2RS",
      "6032-2rs",
      "6032-2RSR",
      "6032-2RS-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6032-ZZ-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6032-2Z",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 142,
    "static_load_kN": 136,
    "limiting_speed_rpm": 3150,
    "reference_speed_rpm": 3750,
    "weight_g": 5310,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6032-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 240 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6032-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 6032 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6032-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.",
      "Shielded 6032-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-ZZ-FAG-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 240 mm OD should be round within IT7; an oval bore pinches the outer ring of 6032-ZZ-FAG and shows up later as two-point loaded raceway wear.",
      "Schaeffler HR 1 lists the shielded version as 6032-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.",
      "FAG lists the mechanical limiting speed at 3150 r/min for 6032 (thermal reference speed 3750 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 160 mm bore places 6032 at the lower end of Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6032 at 142 kN dynamic (C) and 136 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 5310 g (5.3 kg), 6032 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 142/136 kN load ratings, mass 5310 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6032-2Z on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6032 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6032; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6032-ZZ-FAG bearing?",
        "a": "A 6032-ZZ-FAG deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 160 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6032 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the FAG suffix for a sealed 6032?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6032-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 160×240×38 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6032-2Z."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6032-2RS-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6032-ZZ",
      "6032-zz",
      "6032-2Z",
      "6032-ZZ-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61834-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61834",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 65,
    "static_load_kN": 73,
    "limiting_speed_rpm": 4100,
    "reference_speed_rpm": 2950,
    "weight_g": 1630,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 61834-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 22.5 mm of radial section separates bore and OD on the 618xx series at 170 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6234.",
      "The open 61834-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61834-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 170 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61834 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 4100 r/min for 61834 (thermal reference speed 2950 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 170 mm bore places 61834 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61834 at 65 kN dynamic (C) and 73 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 1630 g (1.6 kg), 61834 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 65/73 kN load ratings, mass 1630 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61834-FAG on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61834: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61834 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61834-FAG bearing?",
        "a": "A 61834-FAG deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61834 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61834 uses the same ISO 15 envelope (170×215×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61834-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61834-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 61834?",
        "a": "FAG lists the open 61834 under the bare designation 61834-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "Is 61834-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61834-2RS",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61834",
      "61834-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61934-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61934",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 109,
    "static_load_kN": 114,
    "limiting_speed_rpm": 3800,
    "reference_speed_rpm": 3150,
    "weight_g": 2750,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61934 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 230 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass is significant: heat 61934 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Storage matters for open bearings: 61934-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61934 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 230 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61934-FAG.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 61934 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3800 r/min for 61934 (thermal reference speed 3150 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 170 mm bore places 61934 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 109 kN dynamic load rating (C) and 114 kN static (C0), 61934 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2750 g (2.8 kg), 61934 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 109/114 kN load ratings, mass 2750 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61934-FAG on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61934-FAG bearing?",
        "a": "A 61934-FAG deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61934-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61934-FAG need?",
        "a": "The open 61934-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 61934?",
        "a": "FAG lists the open 61934 under the bare designation 61934-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61934 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61934-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61934-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61934",
      "61934-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16034",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16034",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 136,
    "limiting_speed_rpm": 3500,
    "reference_speed_rpm": 2850,
    "weight_g": 5100,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 16034 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 160xx narrow section at 170 mm bore shares the 260 mm outside diameter of the 6034 but is only 28 mm wide; a 6034 in a 28 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "Storage matters for open bearings: 16034 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16034 units.",
      "Measure the shaft, do not trust the drawing: a 170 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 16034.",
      "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 16034 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3500 r/min for 16034 (thermal reference speed 2850 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 170 mm bore places 16034 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 136 kN static (C0), 16034 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 5100 g (5.1 kg), 16034 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×260×28 mm envelope of 16034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 131/136 kN load ratings, mass 5100 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16034 on the 170×260×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16034 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16034 bearing?",
        "a": "A 16034 deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 28 mm width (6.693 × 10.236 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 16034 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 16034 uses the same ISO 15 envelope (170×260×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 16034 have?",
        "a": "Unless a clearance suffix says otherwise, 16034 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16034 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 16034?",
        "a": "FAG lists the open 16034 under the bare designation 16034; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 16034."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16034-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×260×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6034-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6034",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 179,
    "static_load_kN": 172,
    "limiting_speed_rpm": 3400,
    "reference_speed_rpm": 3550,
    "weight_g": 7100,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "6034 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 260 mm outside diameter and 42 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6034-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6034-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 42 mm-wide ring of 6034-FAG drags the lip and overheats it.",
      "The housing bore for the 260 mm OD should be round within IT7; an oval bore pinches the outer ring of 6034-FAG and shows up later as two-point loaded raceway wear.",
      "The open 6034 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3400 r/min for 6034 (thermal reference speed 3550 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 170 mm bore places 6034 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6034 at 179 kN dynamic (C) and 172 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 7100 g (7.1 kg), 6034 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 179/172 kN load ratings, mass 7100 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6034-FAG on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6034-FAG bearing?",
        "a": "A 6034-FAG deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6034 mean?",
        "a": "A bare 6034 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6000 compare with other series at the same 170 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the FAG order number for an open 6034?",
        "a": "FAG lists the open 6034 under the bare designation 6034-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "Does FAG offer 6034 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6034-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6034-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6034",
      "6034-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6034-2RS",
    "brand": "FAG",
    "manufacturer_designation": "FAG 6034-2RSR",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 179,
    "static_load_kN": 172,
    "limiting_speed_rpm": 1340,
    "weight_g": 7120,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6034-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 6034-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 170 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6234 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6034-2RS runs slower and cooler-limited than the open 6034; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6034-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Never mix components between two 6034-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Schaeffler HR 1 lists the lip-contact sealed version as 6034-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.",
      "FAG lists the mechanical limiting speed at only 1340 r/min for 6034; this is a heavy-section size where cage inertia and centrifugal force cap rotation — do not run this size in a high-speed position, step to a smaller bearing on the same bore instead.",
      "The 170 mm bore places 6034 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 6034 at 179 kN dynamic (C) and 172 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 7120 g (7.1 kg), 6034 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 179/172 kN load ratings, mass 7120 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6034-2RSR on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 6034: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6034-2RS bearing?",
        "a": "A 6034-2RS deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6034-2RS need?",
        "a": "6034-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6034 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6034 bore code work?",
        "a": "The last two digits of 6034 are bore code 34, giving 34 × 5 = 170 mm bore. The 260 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG suffix for a sealed 6034?",
        "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6034-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 170×260×42 mm ISO 15 envelope."
      },
      {
        "q": "Is 6034-2RSR an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6034-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=278",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6034-2RS",
      "6034-2rs",
      "6034-2RSR"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61836-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61836",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 225,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 66,
    "static_load_kN": 76,
    "limiting_speed_rpm": 3900,
    "reference_speed_rpm": 2750,
    "weight_g": 1720,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 180 mm of 61836-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.",
      "Storage matters for open bearings: 61836-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61836 units.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61836 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3900 r/min for 61836 (thermal reference speed 2750 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 180 mm bore places 61836 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61836 at 66 kN dynamic (C) and 76 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but under shock the pressed steel cage can become the limiting element — consider the machined brass cage (suffix M) for impact duty.",
      "At 1720 g (1.7 kg), 61836 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 180×225×22 mm envelope of 61836 gives a D/d ratio of 1.25 and only 22.5 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 66/76 kN load ratings, mass 1720 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61836-FAG on the 180×225×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61836 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61836; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61836: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61836-FAG bearing?",
        "a": "A 61836-FAG deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61836-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61836-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61836 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61836-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61836?",
        "a": "FAG lists the open 61836 under the bare designation 61836-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Is 61836-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61836-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61836",
      "61836-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61936-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61936",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 136,
    "limiting_speed_rpm": 3500,
    "reference_speed_rpm": 3200,
    "weight_g": 4170,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61936 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass is significant: heat 61936 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61936-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 180×250×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61936-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 61936 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3500 r/min for 61936 (thermal reference speed 3200 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 180 mm bore places 61936 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 136 kN static (C0), 61936 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 4170 g (4.2 kg), 61936 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 180×250×33 mm envelope of 61936 gives a D/d ratio of 1.39 and only 35.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 131/136 kN load ratings, mass 4170 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61936-FAG on the 180×250×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61936 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61936; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61936-FAG bearing?",
        "a": "A 61936-FAG deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61936 mean?",
        "a": "A bare 61936 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61900 compare with other series at the same 180 mm bore?",
        "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the FAG order number for an open 61936?",
        "a": "FAG lists the open 61936 under the bare designation 61936-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61936 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61936-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61936-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61936",
      "61936-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16036",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16036",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 140,
    "static_load_kN": 146,
    "limiting_speed_rpm": 3350,
    "reference_speed_rpm": 2950,
    "weight_g": 6860,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "16036 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 36 by five gives the 180 mm bore; the 280 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 180 mm of 16036 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 160xx narrow section at 180 mm bore shares the 280 mm outside diameter of the 6036 but is only 31 mm wide; a 6036 in a 31 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "Storage matters for open bearings: 16036 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16036 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 16036 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3350 r/min for 16036 (thermal reference speed 2950 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 180 mm bore places 16036 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 16036 at 140 kN dynamic (C) and 146 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 6860 g (6.9 kg), 16036 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 180×280×31 mm envelope of 16036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 140/146 kN load ratings, mass 6860 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16036 on the 180×280×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16036 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16036 bearing?",
        "a": "A 16036 deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 31 mm width (7.087 × 11.024 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 16036 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 16036 uses the same ISO 15 envelope (180×280×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 16036 have?",
        "a": "Unless a clearance suffix says otherwise, 16036 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16036 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 16036?",
        "a": "FAG lists the open 16036 under the bare designation 16036; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does FAG offer 16036 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16036 for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16036-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×280×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61838-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61838",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 240,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 73,
    "static_load_kN": 85,
    "limiting_speed_rpm": 3650,
    "reference_speed_rpm": 2700,
    "weight_g": 2220,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 190 mm of 61838-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 190 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6238.",
      "Storage matters for open bearings: 61838-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61838 units.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Never mix components between two 61838-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 61838 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3650 r/min for 61838 (thermal reference speed 2700 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 190 mm bore places 61838 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 73 kN dynamic load rating (C) and 85 kN static (C0), 61838 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2220 g (2.2 kg), 61838 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 190×240×24 mm envelope of 61838 gives a D/d ratio of 1.26 and only 25.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 73/85 kN load ratings, mass 2220 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61838-FAG on the 190×240×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61838 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61838-FAG bearing?",
        "a": "A 61838-FAG deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61838-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61838-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61838 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61838-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61838?",
        "a": "FAG lists the open 61838 under the bare designation 61838-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Is 61838-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61838-RSR",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61838",
      "61838-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61938-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61938",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 140,
    "static_load_kN": 146,
    "limiting_speed_rpm": 3350,
    "reference_speed_rpm": 3000,
    "weight_g": 4320,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61938 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 260 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (35.0 mm section height at 190 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61938-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 190×260×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 61938-FAG drags the lip and overheats it.",
      "The open 61938 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3350 r/min for 61938 (thermal reference speed 3000 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 190 mm bore places 61938 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61938 at 140 kN dynamic (C) and 146 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 4320 g (4.3 kg), 61938 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 190×260×33 mm envelope of 61938 gives a D/d ratio of 1.37 and only 35.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 140/146 kN load ratings, mass 4320 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61938-FAG on the 190×260×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61938 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61938 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61938: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61938-FAG bearing?",
        "a": "A 61938-FAG deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61938-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61938-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61938 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61938-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61938?",
        "a": "FAG lists the open 61938 under the bare designation 61938-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61938 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61938-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61938-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61938-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61938",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61938-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61938",
      "61938-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16038",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16038",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 158,
    "static_load_kN": 168,
    "limiting_speed_rpm": 3100,
    "reference_speed_rpm": 2650,
    "weight_g": 7040,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "16038 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 38 by five gives the 190 mm bore; the 290 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass is significant: heat 16038 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 160xx narrow section at 190 mm bore shares the 290 mm outside diameter of the 6038 but is only 31 mm wide; a 6038 in a 31 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "Storage matters for open bearings: 16038 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16038 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 16038 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3100 r/min for 16038 (thermal reference speed 2650 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 190 mm bore places 16038 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 16038 at 158 kN dynamic (C) and 168 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 7040 g (7.0 kg), 16038 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 190×290×31 mm envelope of 16038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 158/168 kN load ratings, mass 7040 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16038 on the 190×290×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16038 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16038 bearing?",
        "a": "A 16038 deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 31 mm width (7.48 × 11.417 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 16000 compare with other series at the same 190 mm bore?",
        "a": "160 is the narrow extra-light section: 290×31 mm with a 50.0 mm radial section at 190 mm bore. It has the same bore and outside diameter as the 6038 but a narrower ring, so the two are not width-interchangeable; it appears in the manufacturer catalogues used on this site."
      },
      {
        "q": "Are 16038 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 16038 uses the same ISO 15 envelope (190×290×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 16038?",
        "a": "FAG lists the open 16038 under the bare designation 16038; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Does FAG offer 16038 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16038 for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16038-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×290×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61840-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61840",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 250,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 74,
    "static_load_kN": 88,
    "limiting_speed_rpm": 3500,
    "reference_speed_rpm": 2550,
    "weight_g": 2280,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61840 carries bore code 40 = 200 mm. Outside diameter 250 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 200 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6240.",
      "The open 61840-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 200×250×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61840-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Measure the shaft, do not trust the drawing: a 200 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61840-FAG.",
      "The open 61840 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3500 r/min for 61840 (thermal reference speed 2550 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 200 mm bore places 61840 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 74 kN dynamic load rating (C) and 88 kN static (C0), 61840 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2280 g (2.3 kg), 61840 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 200×250×24 mm envelope of 61840 gives a D/d ratio of 1.25 and only 25.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 74/88 kN load ratings, mass 2280 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61840-FAG on the 200×250×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61840 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61840-FAG bearing?",
        "a": "A 61840-FAG deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 200 mm bore?",
        "a": "618 is an extra-thin section: 250×24 mm, only 25.0 mm radial section at 200 mm bore, far smaller than a 6240, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61840 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61840 uses the same ISO 15 envelope (200×250×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the FAG order number for an open 61840?",
        "a": "FAG lists the open 61840 under the bare designation 61840-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61840 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61840-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61840-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61840-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61840",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61840",
      "61840-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61940-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61940",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 158,
    "static_load_kN": 168,
    "limiting_speed_rpm": 3100,
    "reference_speed_rpm": 2950,
    "weight_g": 6270,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass is significant: heat 61940 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Storage matters for open bearings: 61940-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61940 units.",
      "Never mix components between two 61940-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61940 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3100 r/min for 61940 (thermal reference speed 2950 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 200 mm bore places 61940 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 61940 at 158 kN dynamic (C) and 168 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 6270 g (6.3 kg), 61940 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 200×280×38 mm envelope of 61940 gives a D/d ratio of 1.40 and 40.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 158/168 kN load ratings, mass 6270 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61940-FAG on the 200×280×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61940 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61940: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61940-FAG bearing?",
        "a": "A 61940-FAG deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61940-FAG need?",
        "a": "The open 61940-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61940 bore code work?",
        "a": "The last two digits of 61940 are bore code 40, giving 40 × 5 = 200 mm bore. The 280 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the FAG order number for an open 61940?",
        "a": "FAG lists the open 61940 under the bare designation 61940-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61940 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61940-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61940-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61940",
      "61940-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "16040",
    "brand": "FAG",
    "manufacturer_designation": "FAG 16040",
    "series": "16000-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 186,
    "static_load_kN": 202,
    "limiting_speed_rpm": 2850,
    "reference_speed_rpm": 2470,
    "weight_g": 8970,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 16000-series (the narrow extra-light section of ISO 15) the last two digits encode the bore: 16040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 200 mm of 16040 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 160xx narrow section at 200 mm bore shares the 310 mm outside diameter of the 6040 but is only 34 mm wide; a 6040 in a 34 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.",
      "The open 16040 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×310×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16040 units.",
      "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 16000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 16040 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 2850 r/min for 16040 (thermal reference speed 2470 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 200 mm bore places 16040 in Schaeffler's large-size range; at these diameters the pressed steel cage is speed-limited and FAG commonly offers a machined brass cage (suffix M) as an option. Verify cage material and relubrication provision with the distributor, and do not extrapolate small-bore speed ratings to this size.",
      "FAG rates 16040 at 186 kN dynamic (C) and 202 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 8970 g (9.0 kg), 16040 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 200×310×34 mm envelope of 16040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.",
      "The 186/202 kN load ratings, mass 8970 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16040 on the 200×310×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16040 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 16040 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 16040; the standard NBR lip is the economical general-duty choice, not the high-temperature one."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 16040 bearing?",
        "a": "A 16040 deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 34 mm width (7.874 × 12.205 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 16040 bore code work?",
        "a": "The last two digits of 16040 are bore code 40, giving 40 × 5 = 200 mm bore. The 310 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 16040 mean?",
        "a": "A bare 16040 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the FAG order number for an open 16040?",
        "a": "FAG lists the open 16040 under the bare designation 16040; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "Is 16040 an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "16040-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×310×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "16040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61844-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61844",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 270,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 78,
    "static_load_kN": 97,
    "limiting_speed_rpm": 3200,
    "reference_speed_rpm": 2320,
    "weight_g": 2500,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61844 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 270 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass is significant: heat 61844 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.",
      "Storage matters for open bearings: 61844-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61844 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 270 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61844-FAG.",
      "The open 61844 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 3200 r/min for 61844 (thermal reference speed 2320 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 220 mm bore places 61844 at the upper end of the HR 1 single-row deep-groove extract; this is a heavy-engineering size where centrifugal force, mounting heat and housing alignment dominate. FAG supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use grease speed figures for this size without a Schaeffler engineering review.",
      "At 78 kN dynamic load rating (C) and 97 kN static (C0), 61844 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 2500 g (2.5 kg), 61844 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 220×270×24 mm envelope of 61844 gives a D/d ratio of 1.23 and only 25.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 78/97 kN load ratings, mass 2500 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61844-FAG on the 220×270×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61844 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.",
      "Schaeffler's medias/eKatalog is the live source for the current execution of 61844: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61844-FAG bearing?",
        "a": "A 61844-FAG deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61844-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61844-FAG need?",
        "a": "The open 61844-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the FAG order number for an open 61844?",
        "a": "FAG lists the open 61844 under the bare designation 61844-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "Is 61844-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61844-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61844",
      "61844-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61944-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61944",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 186,
    "static_load_kN": 202,
    "limiting_speed_rpm": 2850,
    "reference_speed_rpm": 2600,
    "weight_g": 6560,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 220 mm of 61944-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 220 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61944-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61944 units.",
      "Vibration during standstill brinells the raceways of a 220 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Never mix components between two 61944-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 61944 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 2850 r/min for 61944 (thermal reference speed 2600 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 220 mm bore places 61944 at the upper end of the HR 1 single-row deep-groove extract; this is a heavy-engineering size where centrifugal force, mounting heat and housing alignment dominate. FAG supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use grease speed figures for this size without a Schaeffler engineering review.",
      "FAG rates 61944 at 186 kN dynamic (C) and 202 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 6560 g (6.6 kg), 61944 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 220×300×38 mm envelope of 61944 gives a D/d ratio of 1.36 and only 40.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 186/202 kN load ratings, mass 6560 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61944-FAG on the 220×300×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61944 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61944; the standard NBR lip is the economical general-duty choice, not the high-temperature one.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61944-FAG bearing?",
        "a": "A 61944-FAG deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61944-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61944-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61944 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61944-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61944?",
        "a": "FAG lists the open 61944 under the bare designation 61944-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "Is 61944-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61944-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61944",
      "61944-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61848-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61848",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 300,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 100,
    "static_load_kN": 124,
    "limiting_speed_rpm": 2900,
    "reference_speed_rpm": 2260,
    "weight_g": 4800,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "61848 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 48 by five gives the 240 mm bore; the 300 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass is significant: heat 61848 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 30.0 mm of radial section separates bore and OD on the 618xx series at 240 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6248.",
      "The open 61848-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 240×300×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61848 units.",
      "The housing bore for the 300 mm OD should be round within IT7; an oval bore pinches the outer ring of 61848-FAG and shows up later as two-point loaded raceway wear.",
      "Never mix components between two 61848-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 61848 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 2900 r/min for 61848 (thermal reference speed 2260 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 240 mm bore places 61848 at the upper end of the HR 1 single-row deep-groove extract; this is a heavy-engineering size where centrifugal force, mounting heat and housing alignment dominate. FAG supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use grease speed figures for this size without a Schaeffler engineering review.",
      "At 100 kN dynamic load rating (C) and 124 kN static (C0), 61848 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 4800 g (4.8 kg), 61848 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 240×300×28 mm envelope of 61848 gives a D/d ratio of 1.25 and only 30.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 100/124 kN load ratings, mass 4800 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61848-FAG on the 240×300×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61848 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61848-FAG bearing?",
        "a": "A 61848-FAG deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61848 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61848 uses the same ISO 15 envelope (240×300×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61848-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61848-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61848 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the FAG order number for an open 61848?",
        "a": "FAG lists the open 61848 under the bare designation 61848-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "Does FAG offer 61848 with C3 clearance?",
        "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61848-FAG for normal duty."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61848-NSK",
        "equiv_brand": "NSK",
        "level": "full",
        "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61848-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61848",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61848",
      "61848-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61948-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61948",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 211,
    "static_load_kN": 240,
    "limiting_speed_rpm": 2600,
    "reference_speed_rpm": 2330,
    "weight_g": 6780,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass is significant: heat 61948 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61948-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61948 units.",
      "The housing bore for the 320 mm OD should be round within IT7; an oval bore pinches the outer ring of 61948-FAG and shows up later as two-point loaded raceway wear.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61948-FAG drags the lip and overheats it.",
      "The open 61948 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 2600 r/min for 61948 (thermal reference speed 2330 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 240 mm bore places 61948 at the upper end of the HR 1 single-row deep-groove extract; this is a heavy-engineering size where centrifugal force, mounting heat and housing alignment dominate. FAG supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use grease speed figures for this size without a Schaeffler engineering review.",
      "FAG rates 61948 at 211 kN dynamic (C) and 240 kN static (C0); this is an extreme-load rating at the top of the HR 1 single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate achievable life — request a Schaeffler application review rather than relying on catalogue L10 alone.",
      "At 6780 g (6.8 kg), 61948 is a heavy FAG bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 240×320×38 mm envelope of 61948 gives a D/d ratio of 1.33 and only 40.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 211/240 kN load ratings, mass 6780 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61948-FAG on the 240×320×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61948 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61948-FAG bearing?",
        "a": "A 61948-FAG deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61948-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61948-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61948 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61948-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61948?",
        "a": "FAG lists the open 61948 under the bare designation 61948-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "What is the difference between FAG 2RZ and 2RSR seals?",
        "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61948-FAG."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61948-ZZ",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-NSK",
        "equiv_brand": "NSK",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61948",
      "61948-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61852-FAG",
    "brand": "FAG",
    "manufacturer_designation": "FAG 61852",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 260,
    "D_mm": 320,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 102,
    "static_load_kN": 132,
    "limiting_speed_rpm": 2700,
    "reference_speed_rpm": 2070,
    "weight_g": 4150,
    "weight_estimated": false,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61852 carries bore code 52 = 260 mm. Outside diameter 320 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 260 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 260 mm of 61852-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 30.0 mm of radial section separates bore and OD on the 618xx series at 260 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6252.",
      "Storage matters for open bearings: 61852-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61852 units.",
      "Never mix components between two 61852-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61852-FAG.",
      "The open 61852 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.",
      "FAG lists the mechanical limiting speed at 2700 r/min for 61852 (thermal reference speed 2070 r/min); the thermal reference speed is the binding figure for continuous duty — size the lubrication interval off the reference speed, not the mechanical limit.",
      "The 260 mm bore places 61852 at the upper end of the HR 1 single-row deep-groove extract; this is a heavy-engineering size where centrifugal force, mounting heat and housing alignment dominate. FAG supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use grease speed figures for this size without a Schaeffler engineering review.",
      "At 102 kN dynamic load rating (C) and 132 kN static (C0), 61852 is a heavy-load FAG bearing for industrial gearboxes and large conveyors; Schaeffler expects a machined brass cage (suffix M) at this rating for shock duty, and C0 must be checked against mounting or lifting loads.",
      "At 4150 g (4.2 kg), 61852 needs mechanical handling for mounting; Schaeffler recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting provision if the housing is pre-assembled.",
      "The 260×320×28 mm envelope of 61852 gives a D/d ratio of 1.23 and only 30.0 mm radial section height — an ultra-thin section in the HR 1 range where shaft deflection and housing ovality load the ball-raceway contact directly; verify shaft stiffness (target deflection under 0.05 mm) before choosing it over a 62-series.",
      "The 102/132 kN load ratings, mass 4150 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61852-FAG on the 260×320×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61852 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.",
      "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.",
      "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61852-FAG bearing?",
        "a": "A 61852-FAG deep-groove ball bearing has a 260 mm bore, 320 mm outer diameter and 28 mm width (10.236 × 12.598 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61852-FAG have?",
        "a": "Unless a clearance suffix says otherwise, 61852-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61852 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61852-FAG be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 260 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the FAG order number for an open 61852?",
        "a": "FAG lists the open 61852 under the bare designation 61852-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 260 mm bore envelope."
      },
      {
        "q": "Is 61852-FAG an X-life bearing?",
        "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61852-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 260×320×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61852",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×320×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=280",
    "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)",
    "extracted_at": "2026-09-25",
    "last_verified": "2026-09-25",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61852",
      "61852-FAG"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6404-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 72,
    "B_mm": 19,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 364,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6404-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 20 mm bore (72 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6404-2RS runs slower and cooler-limited than the open 6404; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6404-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6404-2RS bearing?",
        "a": "A 6404-2RS deep-groove ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 364 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6404 bore code work?",
        "a": "The last two digits of 6404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6404-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 20 mm bore?",
        "a": "The '4' is the heavy diameter series: 72×19 mm, 26.0 mm radial section at 20 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6404 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6404 uses the same ISO 15 envelope (20×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6404-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6404-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6404-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6404",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×72×19 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 30.7,
    "static_load_kN": 15,
    "load_derived": true
  },
  {
    "sku": "6405-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 80,
    "B_mm": 21,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 486,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6405-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 25 mm bore (80 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6405-2RS runs slower and cooler-limited than the open 6405; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6405-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6405-2RS bearing?",
        "a": "A 6405-2RS deep-groove ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 486 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6405 bore code work?",
        "a": "The last two digits of 6405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6405-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 25 mm bore?",
        "a": "The '4' is the heavy diameter series: 80×21 mm, 27.5 mm radial section at 25 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6405 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6405 uses the same ISO 15 envelope (25×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6405-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6405-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6405-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6405",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×80×21 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 35.8,
    "static_load_kN": 19.3,
    "load_derived": true
  },
  {
    "sku": "6406-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 90,
    "B_mm": 23,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 664,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6406-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 30 mm bore (90 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6406-2RS runs slower and cooler-limited than the open 6406; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6406-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6406-2RS bearing?",
        "a": "A 6406-2RS deep-groove ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 664 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6406 bore code work?",
        "a": "The last two digits of 6406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6406-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 30 mm bore?",
        "a": "The '4' is the heavy diameter series: 90×23 mm, 30.0 mm radial section at 30 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6406 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6406 uses the same ISO 15 envelope (30×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6406-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6406-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6406-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6406",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 43.6,
    "static_load_kN": 23.6,
    "load_derived": true
  },
  {
    "sku": "6407-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 100,
    "B_mm": 25,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 879,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6407-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 35 mm bore (100 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6407-2RS runs slower and cooler-limited than the open 6407; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6407-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6407-2RS."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6407-2RS bearing?",
        "a": "A 6407-2RS deep-groove ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 879 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6407 bore code work?",
        "a": "The last two digits of 6407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6407-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 35 mm bore?",
        "a": "The '4' is the heavy diameter series: 100×25 mm, 32.5 mm radial section at 35 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6407 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6407 uses the same ISO 15 envelope (35×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6407-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6407-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6407-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6407",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×100×25 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 55.3,
    "static_load_kN": 31,
    "load_derived": true
  },
  {
    "sku": "6408-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 110,
    "B_mm": 27,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 1136,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6408-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 40 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6408-2RS runs slower and cooler-limited than the open 6408; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6408-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6408-2RS bearing?",
        "a": "A 6408-2RS deep-groove ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1136 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6408 bore code work?",
        "a": "The last two digits of 6408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6408-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 40 mm bore?",
        "a": "The '4' is the heavy diameter series: 110×27 mm, 35.0 mm radial section at 40 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6408 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6408 uses the same ISO 15 envelope (40×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6408-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6408-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6408-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6408",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×110×27 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 63.7,
    "static_load_kN": 36.5,
    "load_derived": true
  },
  {
    "sku": "6409-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 120,
    "B_mm": 29,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 1438,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6409-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 64xx heavy section at 45 mm bore (120 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6409-2RS runs slower and cooler-limited than the open 6409; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6409-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6409-2RS-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6409-2RS bearing?",
        "a": "A 6409-2RS deep-groove ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1438 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6409 bore code work?",
        "a": "The last two digits of 6409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6409-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 45 mm bore?",
        "a": "The '4' is the heavy diameter series: 120×29 mm, 37.5 mm radial section at 45 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6409 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6409 uses the same ISO 15 envelope (45×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6409-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×120×29 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6409-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×120×29 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6409",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×120×29 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 76.1,
    "static_load_kN": 45,
    "load_derived": true
  },
  {
    "sku": "6410-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 130,
    "B_mm": 31,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 1789,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6410 with C3 for those conditions.",
      "The 64xx heavy section at 50 mm bore (130 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6410-2RS runs slower and cooler-limited than the open 6410; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6410-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6410-2RS bearing?",
        "a": "A 6410-2RS deep-groove ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1789 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6410 bore code work?",
        "a": "The last two digits of 6410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6410-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 50 mm bore?",
        "a": "The '4' is the heavy diameter series: 130×31 mm, 40.0 mm radial section at 50 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6410 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6410 uses the same ISO 15 envelope (50×130×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6410-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6410-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6410",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×130×31 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 87.1,
    "static_load_kN": 52,
    "load_derived": true
  },
  {
    "sku": "6411-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 140,
    "B_mm": 33,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 2192,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6411 with C3 for those conditions.",
      "The 64xx heavy section at 55 mm bore (140 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6411-2RS runs slower and cooler-limited than the open 6411; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6411-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6411-2RS bearing?",
        "a": "A 6411-2RS deep-groove ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2192 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6411 bore code work?",
        "a": "The last two digits of 6411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6411-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 55 mm bore?",
        "a": "The '4' is the heavy diameter series: 140×33 mm, 42.5 mm radial section at 55 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6411 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6411 uses the same ISO 15 envelope (55×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6411-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6411-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6411-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6411",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×140×33 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 99.5,
    "static_load_kN": 62,
    "load_derived": true
  },
  {
    "sku": "6412-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 150,
    "B_mm": 35,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 2651,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6412 with C3 for those conditions.",
      "The 64xx heavy section at 60 mm bore (150 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6412-2RS runs slower and cooler-limited than the open 6412; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6412-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6412-2RS bearing?",
        "a": "A 6412-2RS deep-groove ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 2651 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6412 bore code work?",
        "a": "The last two digits of 6412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6412-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 60 mm bore?",
        "a": "The '4' is the heavy diameter series: 150×35 mm, 45.0 mm radial section at 60 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6412 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6412 uses the same ISO 15 envelope (60×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6412-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6412-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6412",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×150×35 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 108,
    "static_load_kN": 69.5,
    "load_derived": true
  },
  {
    "sku": "6413-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 160,
    "B_mm": 37,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 3169,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.",
      "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6413-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6413-2RS for that.",
      "Shielded 6413-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6413-ZZ bearing?",
        "a": "A 6413-ZZ deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6413 bore code work?",
        "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6413-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 65 mm bore?",
        "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6413 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6413-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6413",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 120,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 119,
    "static_load_kN": 78,
    "load_derived": true
  },
  {
    "sku": "6413-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 160,
    "B_mm": 37,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 3169,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6413 with C3 for those conditions.",
      "The 64xx heavy section at 65 mm bore (160 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6413-2RS runs slower and cooler-limited than the open 6413; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6413-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6413-2RS."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6413-2RS bearing?",
        "a": "A 6413-2RS deep-groove ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 3169 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6413 bore code work?",
        "a": "The last two digits of 6413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6413-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 65 mm bore?",
        "a": "The '4' is the heavy diameter series: 160×37 mm, 47.5 mm radial section at 65 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6413 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6413 uses the same ISO 15 envelope (65×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6413-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6413",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×160×37 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 119,
    "static_load_kN": 78,
    "load_derived": true
  },
  {
    "sku": "6414-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 180,
    "B_mm": 42,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 4629,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.",
      "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6414-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6414-2RS for that.",
      "Shielded 6414-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6414-ZZ bearing?",
        "a": "A 6414-ZZ deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6414 bore code work?",
        "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6414-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 70 mm bore?",
        "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6414 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6414 uses the same ISO 15 envelope (70×180×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6414-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×180×42 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6414",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 120,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 143,
    "static_load_kN": 104,
    "load_derived": true
  },
  {
    "sku": "6414-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 180,
    "B_mm": 42,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "weight_g": 4629,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6414 with C3 for those conditions.",
      "The 64xx heavy section at 70 mm bore (180 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6414-2RS runs slower and cooler-limited than the open 6414; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6414-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6414-2RS bearing?",
        "a": "A 6414-2RS deep-groove ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 4629 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6414 bore code work?",
        "a": "The last two digits of 6414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6414-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 70 mm bore?",
        "a": "The '4' is the heavy diameter series: 180×42 mm, 55.0 mm radial section at 70 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6414 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6414 uses the same ISO 15 envelope (70×180×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6414-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×180×42 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6414",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×180×42 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-23",
    "last_verified": "2026-09-23",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "temp_min_c": -30,
    "temp_max_c": 110,
    "clearance_options": [
      "CN",
      "C3"
    ],
    "dynamic_load_kN": 143,
    "static_load_kN": 104,
    "load_derived": true
  },
  {
    "sku": "6400",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 40,
    "B_mm": 12,
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 72,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "fractional-horsepower electric motors",
      "domestic appliances",
      "power tools",
      "small fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6400 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6400 units.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6400 bearing?",
        "a": "A 6400 deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6400 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does no suffix on 6400 mean?",
        "a": "A bare 6400 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6400 compare with other series at the same 10 mm bore?",
        "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6400 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6400",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6400-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 40,
    "B_mm": 12,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 72,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "fractional-horsepower electric motors",
      "domestic appliances",
      "power tools",
      "small fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6400-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6400-2RS for that.",
      "Shielded 6400-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6400-ZZ bearing?",
        "a": "A 6400-ZZ deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6400 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the ZZ suffix on 6400-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 10 mm bore?",
        "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6400 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6400",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6400-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 40,
    "B_mm": 12,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 72,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6400 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "fractional-horsepower electric motors",
      "domestic appliances",
      "power tools",
      "small fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6400 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 10 mm bore (40 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6400-2RS runs slower and cooler-limited than the open 6400; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6400-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6400-2RS bearing?",
        "a": "A 6400-2RS deep-groove ball bearing has a 10 mm bore, 40 mm outer diameter and 12 mm width (0.394 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 72 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6400 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6400 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the 2RS suffix on 6400-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 10 mm bore?",
        "a": "The '4' is the heavy diameter series: 40×12 mm, 15.0 mm radial section at 10 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6400 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6400 uses the same ISO 15 envelope (10×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6400",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6401",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 48,
    "B_mm": 14,
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 121,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "domestic appliances",
      "power tools",
      "small fans and blowers",
      "garden equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6401 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×48×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6401 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6401-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6401 bearing?",
        "a": "A 6401 deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6401 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does no suffix on 6401 mean?",
        "a": "A bare 6401 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6400 compare with other series at the same 12 mm bore?",
        "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6401 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6401",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6401-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 48,
    "B_mm": 14,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 121,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "domestic appliances",
      "power tools",
      "small fans and blowers",
      "garden equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6401-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6401-2RS for that.",
      "Shielded 6401-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6401-ZZ bearing?",
        "a": "A 6401-ZZ deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6401 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the ZZ suffix on 6401-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 12 mm bore?",
        "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6401 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6401",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6401-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 48,
    "B_mm": 14,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 121,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6401 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 48 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "domestic appliances",
      "power tools",
      "small fans and blowers",
      "garden equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6401 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 12 mm bore (48 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6401-2RS runs slower and cooler-limited than the open 6401; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6401-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 48 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6401-2RS."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6401-2RS bearing?",
        "a": "A 6401-2RS deep-groove ball bearing has a 12 mm bore, 48 mm outer diameter and 14 mm width (0.472 × 1.89 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 121 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6401 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6401 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the 2RS suffix on 6401-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 12 mm bore?",
        "a": "The '4' is the heavy diameter series: 48×14 mm, 18.0 mm radial section at 12 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6401 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6401 uses the same ISO 15 envelope (12×48×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6401",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6402",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 149,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "power tools",
      "small fans and blowers",
      "garden equipment",
      "instrument drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6402 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6402 units.",
      "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6402 bearing?",
        "a": "A 6402 deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6402 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does no suffix on 6402 mean?",
        "a": "A bare 6402 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6400 compare with other series at the same 15 mm bore?",
        "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6402 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6402",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6402-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 149,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "power tools",
      "small fans and blowers",
      "garden equipment",
      "instrument drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6402-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6402-2RS for that.",
      "Shielded 6402-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6402-ZZ bearing?",
        "a": "A 6402-ZZ deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6402 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the ZZ suffix on 6402-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 15 mm bore?",
        "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6402 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6402",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6402-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 149,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6402 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "power tools",
      "small fans and blowers",
      "garden equipment",
      "instrument drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6402 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 15 mm bore (52 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6402-2RS runs slower and cooler-limited than the open 6402; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6402-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6402-2RS bearing?",
        "a": "A 6402-2RS deep-groove ball bearing has a 15 mm bore, 52 mm outer diameter and 15 mm width (0.591 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 149 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6402 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6402 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the 2RS suffix on 6402-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 15 mm bore?",
        "a": "The '4' is the heavy diameter series: 52×15 mm, 18.5 mm radial section at 15 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6402 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6402 uses the same ISO 15 envelope (15×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6402",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6403-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 62,
    "B_mm": 17,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 242,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6403 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "small fans and blowers",
      "garden equipment",
      "instrument drives",
      "fractional-horsepower electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 6403 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 64xx heavy section at 17 mm bore (62 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6403-2RS runs slower and cooler-limited than the open 6403; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6403-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6403-2RS-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6403-2RS bearing?",
        "a": "A 6403-2RS deep-groove ball bearing has a 17 mm bore, 62 mm outer diameter and 17 mm width (0.669 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 242 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "Why does 6403 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 6403 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the 2RS suffix on 6403-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 17 mm bore?",
        "a": "The '4' is the heavy diameter series: 62×17 mm, 22.5 mm radial section at 17 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6403 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6403 uses the same ISO 15 envelope (17×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6403-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6403-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6403-ZZ",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (2RS vs ZZ) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6403",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×62×17 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 22.9,
    "static_load_kN": 10.8,
    "load_derived": true
  },
  {
    "sku": "6415-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 190,
    "B_mm": 45,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 5496,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.",
      "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6415-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6415-2RS for that.",
      "Shielded 6415-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6415-ZZ."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6415-ZZ bearing?",
        "a": "A 6415-ZZ deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 5496 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6415 bore code work?",
        "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6415-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 75 mm bore?",
        "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6415 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6415-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×190×45 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6415",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 153,
    "static_load_kN": 114,
    "load_derived": true
  },
  {
    "sku": "6415-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 190,
    "B_mm": 45,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 5496,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6415 carries bore code 15 = 75 mm. Outside diameter 190 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6415 with C3 for those conditions.",
      "The 64xx heavy section at 75 mm bore (190 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6415-2RS runs slower and cooler-limited than the open 6415; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6415-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6415-2RS-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6415-2RS bearing?",
        "a": "A 6415-2RS deep-groove ball bearing has a 75 mm bore, 190 mm outer diameter and 45 mm width (2.953 × 7.48 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 5496 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6415 bore code work?",
        "a": "The last two digits of 6415 are bore code 15, giving 15 × 5 = 75 mm bore. The 190 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6415-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 75 mm bore?",
        "a": "The '4' is the heavy diameter series: 190×45 mm, 57.5 mm radial section at 75 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6415 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6415 uses the same ISO 15 envelope (75×190×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6415-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×190×45 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6415",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×190×45 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 153,
    "static_load_kN": 114,
    "load_derived": true
  },
  {
    "sku": "6416-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 200,
    "B_mm": 48,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 6463,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6416-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6416-2RS for that.",
      "Shielded 6416-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6416-ZZ bearing?",
        "a": "A 6416-ZZ deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 6463 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6416 bore code work?",
        "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6416-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 80 mm bore?",
        "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6416 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6416-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6416",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 163,
    "static_load_kN": 125,
    "load_derived": true
  },
  {
    "sku": "6416-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 200,
    "B_mm": 48,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 6463,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6416 carries bore code 16 = 80 mm. Outside diameter 200 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 80 mm bore (200 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6416-2RS runs slower and cooler-limited than the open 6416; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6416-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6416-2RS bearing?",
        "a": "A 6416-2RS deep-groove ball bearing has a 80 mm bore, 200 mm outer diameter and 48 mm width (3.15 × 7.874 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 6463 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6416 bore code work?",
        "a": "The last two digits of 6416 are bore code 16, giving 16 × 5 = 80 mm bore. The 200 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6416-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 80 mm bore?",
        "a": "The '4' is the heavy diameter series: 200×48 mm, 60.0 mm radial section at 80 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6416 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6416 uses the same ISO 15 envelope (80×200×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6416-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "6416",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×200×48 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 163,
    "static_load_kN": 125,
    "load_derived": true
  },
  {
    "sku": "6417-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 210,
    "B_mm": 52,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 7684,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6417-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6417-2RS for that.",
      "Shielded 6417-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6417-ZZ-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6417-ZZ bearing?",
        "a": "A 6417-ZZ deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 7684 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6417 bore code work?",
        "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6417-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 85 mm bore?",
        "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6417 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6417",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 174,
    "static_load_kN": 137,
    "load_derived": true
  },
  {
    "sku": "6417-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 210,
    "B_mm": 52,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 7684,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6417 carries bore code 17 = 85 mm. Outside diameter 210 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 85 mm bore (210 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6417-2RS runs slower and cooler-limited than the open 6417; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6417-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 52 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6417-2RS bearing?",
        "a": "A 6417-2RS deep-groove ball bearing has a 85 mm bore, 210 mm outer diameter and 52 mm width (3.346 × 8.268 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 7684 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6417 bore code work?",
        "a": "The last two digits of 6417 are bore code 17, giving 17 × 5 = 85 mm bore. The 210 mm outside diameter and 52 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6417-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 85 mm bore?",
        "a": "The '4' is the heavy diameter series: 210×52 mm, 62.5 mm radial section at 85 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6417 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6417 uses the same ISO 15 envelope (85×210×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6417",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×210×52 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 174,
    "static_load_kN": 137,
    "load_derived": true
  },
  {
    "sku": "6418-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 225,
    "B_mm": 54,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 9203,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6418-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6418-2RS for that.",
      "Shielded 6418-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6418-ZZ bearing?",
        "a": "A 6418-ZZ deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 9203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6418 bore code work?",
        "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6418-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 90 mm bore?",
        "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6418 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6418",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 186,
    "static_load_kN": 150,
    "load_derived": true
  },
  {
    "sku": "6418-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 225,
    "B_mm": 54,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 9203,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6418 carries bore code 18 = 90 mm. Outside diameter 225 mm and width 54 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 90 mm bore (225 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6418-2RS runs slower and cooler-limited than the open 6418; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6418-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6418-2RS bearing?",
        "a": "A 6418-2RS deep-groove ball bearing has a 90 mm bore, 225 mm outer diameter and 54 mm width (3.543 × 8.858 × 2.126 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 9203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6418 bore code work?",
        "a": "The last two digits of 6418 are bore code 18, giving 18 × 5 = 90 mm bore. The 225 mm outside diameter and 54 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6418-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 90 mm bore?",
        "a": "The '4' is the heavy diameter series: 225×54 mm, 67.5 mm radial section at 90 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6418 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6418 uses the same ISO 15 envelope (90×225×54 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6418",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×225×54 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {},
    "dynamic_load_kN": 186,
    "static_load_kN": 150,
    "load_derived": true
  },
  {
    "sku": "6419",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 240,
    "B_mm": 55,
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 10707,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6419 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×240×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6419 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6419-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6419 bearing?",
        "a": "A 6419 deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6419 bore code work?",
        "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6419 mean?",
        "a": "A bare 6419 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6400 compare with other series at the same 95 mm bore?",
        "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6419 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6419",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6419-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 240,
    "B_mm": 55,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 10707,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6419-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6419-2RS for that.",
      "Shielded 6419-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6419-ZZ bearing?",
        "a": "A 6419-ZZ deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6419 bore code work?",
        "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6419-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 95 mm bore?",
        "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6419 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6419",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6419-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 240,
    "B_mm": 55,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 10707,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6419 carries bore code 19 = 95 mm. Outside diameter 240 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 95 mm bore (240 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6419-2RS runs slower and cooler-limited than the open 6419; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6419-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6419-2RS."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6419-2RS bearing?",
        "a": "A 6419-2RS deep-groove ball bearing has a 95 mm bore, 240 mm outer diameter and 55 mm width (3.74 × 9.449 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 10707 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6419 bore code work?",
        "a": "The last two digits of 6419 are bore code 19, giving 19 × 5 = 95 mm bore. The 240 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6419-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 95 mm bore?",
        "a": "The '4' is the heavy diameter series: 240×55 mm, 72.5 mm radial section at 95 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6419 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6419 uses the same ISO 15 envelope (95×240×55 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6419",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6420",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 250,
    "B_mm": 58,
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 12203,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "The open 6420 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×250×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6400-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6420 units.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6420 bearing?",
        "a": "A 6420 deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6420 bore code work?",
        "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6420 mean?",
        "a": "A bare 6420 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6400 compare with other series at the same 100 mm bore?",
        "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6420 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6420",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6420-ZZ",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 250,
    "B_mm": 58,
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 12203,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "ZZ shields are non-contact: 6420-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6420-2RS for that.",
      "Shielded 6420-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6420-ZZ bearing?",
        "a": "A 6420-ZZ deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6420 bore code work?",
        "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6420-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6400 compare with other series at the same 100 mm bore?",
        "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6420 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6420",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6420-2RS",
    "brand": "GENERIC-ISO",
    "series": "6400-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 250,
    "B_mm": 58,
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "weight_g": 12203,
    "weight_estimated": true,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6400-series (ISO 15 diameter series 4) the last two digits encode the bore: 6420 carries bore code 20 = 100 mm. Outside diameter 250 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 64xx heavy section at 100 mm bore (250 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm motor gives excess heat and short grease life — use 62/63 there.",
      "Contact seals add drag and heat: 6420-2RS runs slower and cooler-limited than the open 6420; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6420-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6400-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6420-2RS bearing?",
        "a": "A 6420-2RS deep-groove ball bearing has a 100 mm bore, 250 mm outer diameter and 58 mm width (3.937 × 9.843 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 12203 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design."
      },
      {
        "q": "How does the 6420 bore code work?",
        "a": "The last two digits of 6420 are bore code 20, giving 20 × 5 = 100 mm bore. The 250 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6420-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6400 compare with other series at the same 100 mm bore?",
        "a": "The '4' is the heavy diameter series: 250×58 mm, 75.0 mm radial section at 100 mm bore — the highest-capacity single-row 6xx option here, aimed at lower-speed, high-load shafts."
      },
      {
        "q": "Are 6420 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6420 uses the same ISO 15 envelope (100×250×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar)."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6420",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en",
    "catalog_ver": "iso15-ed4-geometry",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [],
    "locale_variants": {}
  },
  {
    "sku": "6000-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6000DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 26,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 1.97,
    "weight_g": 18,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 10 = 10 mm. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6000DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6000 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6000-2RS-NSK runs slower and cooler-limited than the open 6000; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6000-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6000-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 6000-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6000DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 10 mm bore the 6000 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6000 at 5.05 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 18 g, 6000 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.05/1.97 kN load ratings, mass 18 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6000DDU on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6000 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6000-2RS-NSK bearing?",
        "a": "A 6000-2RS-NSK deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6000 bore code work?",
        "a": "The last two digits of 6000 are bore code 10, giving 10 × 5 = 10 mm bore. The 26 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6000-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6000?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6000DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×26×8 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6000 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6000-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6000-2RS",
      "6000-2rs",
      "6000DDU",
      "NSK 6000DDU",
      "6000-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6000-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6000VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 26,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 1.97,
    "weight_g": 18,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 10 = 10 mm. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6000VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6000 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6000-RSR-NSK run faster than contact-seal 6000-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6000-2RS instead.",
      "The low-drag lip of 6000-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 26 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6000-RSR-NSK.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 6000-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6000VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 10 mm bore the 6000 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6000 at 5.05 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 18 g, 6000 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.05/1.97 kN load ratings, mass 18 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6000VV on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6000-RSR-NSK bearing?",
        "a": "A 6000-RSR-NSK deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6000-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6000-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6000 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6000-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6000?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6000VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×26×8 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6000 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6000-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6000-RSR",
      "6000-rsr",
      "6000VV",
      "NSK 6000VV",
      "6000-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6000-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6000ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 26,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 1.97,
    "weight_g": 18,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 10 = 10 mm. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6000ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6000 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.",
      "Do not wash 6000-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6000-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6000ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 10 mm bore the 6000 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6000 at 5.05 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 18 g, 6000 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.05/1.97 kN load ratings, mass 18 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6000ZZ on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6000; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6000-ZZ-NSK bearing?",
        "a": "A 6000-ZZ-NSK deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6000 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6000 uses the same ISO 15 envelope (10×26×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6000-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6000-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6000 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6000?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6000ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×26×8 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6000ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6000-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6000-ZZ",
      "6000-zz",
      "6000ZZ",
      "NSK 6000ZZ",
      "6000-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6000-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6000",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 26,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 1.97,
    "weight_g": 18,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 10 = 10 mm. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6000 with C3 for those conditions.",
      "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6000-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 10×26×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6000-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 26 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6000-NSK.",
      "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6000 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 10 mm bore the 6000 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6000 at 5.05 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 18 g, 6000 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.05/1.97 kN load ratings, mass 18 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6000 on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6000-NSK bearing?",
        "a": "A 6000-NSK deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6000-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6000-NSK need?",
        "a": "The open 6000-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6000?",
        "a": "NSK lists the open 6000 under the bare designation 6000; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 10 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6000?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6000-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6000",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6000",
      "NSK 6000",
      "6000-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6001-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6001DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 28,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.37,
    "weight_g": 22,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6001-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6001DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6001 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Heat is the enemy of the sealed 6001-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6001-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Never mix components between two 6001-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the contact-sealed version as 6001DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 12 mm bore the 6001 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6001 at 5.6 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 22 g, 6001 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.37 kN load ratings, mass 22 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6001DDU on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6001 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6001-2RS-NSK bearing?",
        "a": "A 6001-2RS-NSK deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6001-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6001-2RS-NSK need?",
        "a": "6001-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6001 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6001?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6001DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×28×8 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6001 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6001-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6001-2RS",
      "6001-2rs",
      "6001DDU",
      "NSK 6001DDU",
      "6001-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6001-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6001VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 28,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.37,
    "weight_g": 22,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6001-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6001VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6001 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.",
      "RSR low-friction seals on 6001-RSR-NSK run faster than contact-seal 6001-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6001-2RS instead.",
      "The low-drag lip of 6001-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6001-RSR-NSK.",
      "The housing bore for the 28 mm OD should be round within IT7; an oval bore pinches the outer ring of 6001-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6001VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 12 mm bore the 6001 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6001 at 5.6 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 22 g, 6001 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.37 kN load ratings, mass 22 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6001VV on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6001; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6001-RSR-NSK bearing?",
        "a": "A 6001-RSR-NSK deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6000 compare with other series at the same 12 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6001 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6001 uses the same ISO 15 envelope (12×28×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6001?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6001VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×28×8 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6001VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6001-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6001-RSR",
      "6001-rsr",
      "6001VV",
      "NSK 6001VV",
      "6001-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6001-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6001ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 28,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.37,
    "weight_g": 22,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6001-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6001ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6001 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6001-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6001-2RS for that.",
      "Do not wash 6001-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 6001-ZZ-NSK drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6001-ZZ-NSK.",
      "NSK catalogues the shielded version as 6001ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 12 mm bore the 6001 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6001 at 5.6 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 22 g, 6001 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.37 kN load ratings, mass 22 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6001ZZ on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6001; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6001-ZZ-NSK bearing?",
        "a": "A 6001-ZZ-NSK deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6001-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 12 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (28×8 mm, 8.0 mm radial section) at 12 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6001?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6001ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×28×8 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6001ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6001-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6001-ZZ",
      "6001-zz",
      "6001ZZ",
      "NSK 6001ZZ",
      "6001-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6001-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6001",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 28,
    "B_mm": 8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.37,
    "weight_g": 22,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6001 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 28 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6001 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6001-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6001 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6001-NSK-C3. No clearance suffix means normal CN clearance.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 28 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6001-NSK.",
      "The open 6001 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 12 mm bore the 6001 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6001 at 5.6 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 22 g, 6001 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.37 kN load ratings, mass 22 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6001 on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6001; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6001-NSK bearing?",
        "a": "A 6001-NSK deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6001-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6001-NSK need?",
        "a": "The open 6001-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6001?",
        "a": "NSK lists the open 6001 under the bare designation 6001; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 12 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6001 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6001-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6001",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6001",
      "NSK 6001",
      "6001-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6002-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6002DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 32,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.15,
    "static_load_kN": 2.84,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 15 = 15 mm. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6002DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6002 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6002-2RS-NSK runs slower and cooler-limited than the open 6002; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6002-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6002-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6002DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 15 mm bore the 6002 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6002 at 6.15 kN dynamic (C) and 2.84 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 6002 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.15/2.84 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6002DDU on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6002-2RS-NSK bearing?",
        "a": "A 6002-2RS-NSK deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6002-2RS-NSK need?",
        "a": "6002-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6002 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6002 bore code work?",
        "a": "The last two digits of 6002 are bore code 15, giving 15 × 5 = 15 mm bore. The 32 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6002?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6002DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×32×9 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6002DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6002-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6002-2RS",
      "6002-2rs",
      "6002DDU",
      "NSK 6002DDU",
      "6002-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6002-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6002VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 32,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.15,
    "static_load_kN": 2.84,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6002-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 32 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6002VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6002 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6002-RSR-NSK run faster than contact-seal 6002-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6002-2RS instead.",
      "The low-drag lip of 6002-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6002-RSR-NSK-C3. No clearance suffix means normal CN clearance.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6002VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 15 mm bore the 6002 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6002 at 6.15 kN dynamic (C) and 2.84 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 6002 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.15/2.84 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6002VV on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6002-RSR-NSK bearing?",
        "a": "A 6002-RSR-NSK deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6002-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6002-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6002 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6002-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6002?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6002VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×32×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6002VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6002-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6002-RSR",
      "6002-rsr",
      "6002VV",
      "NSK 6002VV",
      "6002-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6002-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6002ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 32,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.15,
    "static_load_kN": 2.84,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 15 = 15 mm. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6002ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6002 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6002-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6002-2RS for that.",
      "Shielded 6002-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6002ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 15 mm bore the 6002 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6002 at 6.15 kN dynamic (C) and 2.84 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 6002 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.15/2.84 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6002ZZ on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6002-ZZ-NSK bearing?",
        "a": "A 6002-ZZ-NSK deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6002 bore code work?",
        "a": "The last two digits of 6002 are bore code 15, giving 15 × 5 = 15 mm bore. The 32 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6002-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6002?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6002ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×32×9 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6002 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6002-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6002-ZZ",
      "6002-zz",
      "6002ZZ",
      "NSK 6002ZZ",
      "6002-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6002-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6002",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 32,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.15,
    "static_load_kN": 2.84,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 15 = 15 mm. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6002 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6002-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6002-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 6002-NSK drags the lip and overheats it.",
      "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002-NSK and shows up later as two-point loaded raceway wear.",
      "The open 6002 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 15 mm bore the 6002 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6002 at 6.15 kN dynamic (C) and 2.84 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 6002 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.15/2.84 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6002 on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6002; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6002-NSK bearing?",
        "a": "A 6002-NSK deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6002 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6002-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6002-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6002 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6002?",
        "a": "NSK lists the open 6002 under the bare designation 6002; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 15 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6002 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6002-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6002",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6002",
      "NSK 6002",
      "6002-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6003-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6003DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 35,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.6,
    "static_load_kN": 3.25,
    "weight_g": 41,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 17 = 17 mm. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6003DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 17 mm bore the ring mass is significant: heat 6003 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 17 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6217 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6003-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6003-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6003DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 17 mm bore the 6003 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6003 at 6.6 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 41 g, 6003 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.6/3.25 kN load ratings, mass 41 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6003DDU on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6003-2RS-NSK bearing?",
        "a": "A 6003-2RS-NSK deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6003-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6003-2RS-NSK need?",
        "a": "6003-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6003 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6003?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6003DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×35×10 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6003DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6003-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6003-2RS",
      "6003-2rs",
      "6003DDU",
      "NSK 6003DDU",
      "6003-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6003-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6003VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 35,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.6,
    "static_load_kN": 3.25,
    "weight_g": 41,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 17 = 17 mm. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6003VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 6003-RSR-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6003-RSR-NSK run faster than contact-seal 6003-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6003-2RS instead.",
      "The non-contact lip of 6003-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 6003-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6003VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 17 mm bore the 6003 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6003 at 6.6 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 41 g, 6003 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.6/3.25 kN load ratings, mass 41 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6003VV on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6003-RSR-NSK bearing?",
        "a": "A 6003-RSR-NSK deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6003-RSR-NSK need?",
        "a": "6003-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6003 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6003 bore code work?",
        "a": "The last two digits of 6003 are bore code 17, giving 17 × 5 = 17 mm bore. The 35 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6003?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6003VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×35×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6003 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6003-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6003-RSR",
      "6003-rsr",
      "6003VV",
      "NSK 6003VV",
      "6003-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6003-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6003ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 35,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.6,
    "static_load_kN": 3.25,
    "weight_g": 41,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6003-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6003ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6003-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6003-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6003-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 6003-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6003ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 17 mm bore the 6003 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6003 at 6.6 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 41 g, 6003 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.6/3.25 kN load ratings, mass 41 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6003ZZ on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6003-ZZ-NSK bearing?",
        "a": "A 6003-ZZ-NSK deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6003-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6003-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6003 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6003-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6003?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6003ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×35×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6003ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6003-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6003-ZZ",
      "6003-zz",
      "6003ZZ",
      "NSK 6003ZZ",
      "6003-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6003-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6003",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 35,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 6.6,
    "static_load_kN": 3.25,
    "weight_g": 41,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6003 carries bore code 17 = 17 mm. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 6003-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Storage matters for open bearings: 6003-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6003 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6003-NSK and shows up later as two-point loaded raceway wear.",
      "The open 6003 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 17 mm bore the 6003 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6003 at 6.6 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 41 g, 6003 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 6.6/3.25 kN load ratings, mass 41 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6003 on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6003-NSK bearing?",
        "a": "A 6003-NSK deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6003 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6003-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6003-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6003 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6003?",
        "a": "NSK lists the open 6003 under the bare designation 6003; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 17 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6003?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6003-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6003",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6003",
      "NSK 6003",
      "6003-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6004DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.3,
    "static_load_kN": 5,
    "weight_g": 68,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6004DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6004 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6004-2RS-NSK runs slower and cooler-limited than the open 6004; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6004-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6004DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 20 mm bore puts 6004 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6004 at 10.3 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 68 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.3/5 kN load ratings, mass 68 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6004DDU on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6004; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-2RS-NSK bearing?",
        "a": "A 6004-2RS-NSK deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6004 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6004 uses the same ISO 15 envelope (20×42×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6004-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6004-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6004 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6004?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6004DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×42×12 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6004 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004-2RS",
      "6004-2rs",
      "6004DDU",
      "NSK 6004DDU",
      "6004-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6004VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.3,
    "static_load_kN": 5,
    "weight_g": 68,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6004-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 42 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6004VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6004 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.",
      "The low-drag lip of 6004-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6004-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6004-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6004VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 20 mm bore puts 6004 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6004 at 10.3 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 68 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.3/5 kN load ratings, mass 68 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6004VV on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6004 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-RSR-NSK bearing?",
        "a": "A 6004-RSR-NSK deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6004-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6000 compare with other series at the same 20 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6004?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6004VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×42×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6004VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004-RSR",
      "6004-rsr",
      "6004VV",
      "NSK 6004VV",
      "6004-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6004ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.3,
    "static_load_kN": 5,
    "weight_g": 68,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6004ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-ZZ-NSK.",
      "The 60xx extra-light section at 20 mm bore uses a smaller 42 mm OD than a 6204; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6004-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6004-2RS for that.",
      "Shielded 6004-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6004-ZZ-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6004-ZZ-NSK.",
      "NSK catalogues the shielded version as 6004ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 20 mm bore puts 6004 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6004 at 10.3 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 68 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.3/5 kN load ratings, mass 68 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6004ZZ on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6004; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-ZZ-NSK bearing?",
        "a": "A 6004-ZZ-NSK deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6004-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 20 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6004?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6004ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×42×12 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6004 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004-ZZ",
      "6004-zz",
      "6004ZZ",
      "NSK 6004ZZ",
      "6004-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6004-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6004",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.3,
    "static_load_kN": 5,
    "weight_g": 68,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6004-NSK.",
      "Choosing the 60xx extra-light section saves radial space at 20 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6204 before committing to the smaller envelope.",
      "The open 6004-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 20×42×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6004-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6004-NSK-C3. No clearance suffix means normal CN clearance.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6004 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 20 mm bore puts 6004 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6004 at 10.3 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 68 g, 6004 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×42×12 mm envelope of 6004 gives a D/d ratio of 2.10 and 11.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.3/5 kN load ratings, mass 68 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6004 on the 20×42×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6004 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6004 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6004-NSK bearing?",
        "a": "A 6004-NSK deep-groove ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 20 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (42×12 mm, 11.0 mm radial section) at 20 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6004 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6004 uses the same ISO 15 envelope (20×42×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6004?",
        "a": "NSK lists the open 6004 under the bare designation 6004; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6004 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6004-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6004-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6004",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×42×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6004",
      "NSK 6004",
      "6004-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6005DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 5.85,
    "weight_g": 79,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6005DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6005-2RS-NSK.",
      "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6005-2RS-NSK runs slower and cooler-limited than the open 6005; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6005-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 6005-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6005DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 25 mm bore puts 6005 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6005 at 11.1 kN dynamic (C) and 5.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 79 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 11.1/5.85 kN load ratings, mass 79 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6005DDU on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6005; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6005 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-2RS-NSK bearing?",
        "a": "A 6005-2RS-NSK deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6005-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6005-2RS-NSK need?",
        "a": "6005-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6005 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6005?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6005DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×47×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6005DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005-2RS",
      "6005-2rs",
      "6005DDU",
      "NSK 6005DDU",
      "6005-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6005VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 5.85,
    "weight_g": 79,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6005-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 47 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6005VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-RSR-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.",
      "RSR low-friction seals on 6005-RSR-NSK run faster than contact-seal 6005-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6005-2RS instead.",
      "The non-contact lip of 6005-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6005-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6005VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 25 mm bore puts 6005 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6005 at 11.1 kN dynamic (C) and 5.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 79 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 11.1/5.85 kN load ratings, mass 79 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6005VV on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6005; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-RSR-NSK bearing?",
        "a": "A 6005-RSR-NSK deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6005-RSR-NSK need?",
        "a": "6005-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6005 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6005 bore code work?",
        "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6005?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6005VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×47×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6005VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005-RSR",
      "6005-rsr",
      "6005VV",
      "NSK 6005VV",
      "6005-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6005ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 5.85,
    "weight_g": 79,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6005ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6005-ZZ-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Choosing the 60xx extra-light section saves radial space at 25 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6205 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6005-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6005-2RS for that.",
      "Shielded 6005-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6005-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6005ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 25 mm bore puts 6005 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6005 at 11.1 kN dynamic (C) and 5.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 79 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 11.1/5.85 kN load ratings, mass 79 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6005ZZ on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6005 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-ZZ-NSK bearing?",
        "a": "A 6005-ZZ-NSK deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6005-ZZ-NSK need?",
        "a": "6005-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6005 bore code work?",
        "a": "The last two digits of 6005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6005?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6005ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×47×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6005ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005-ZZ",
      "6005-zz",
      "6005ZZ",
      "NSK 6005ZZ",
      "6005-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6005-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6005",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 5.85,
    "weight_g": 79,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6005 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 47 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6005 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 60xx extra-light section at 25 mm bore uses a smaller 47 mm OD than a 6205; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Storage matters for open bearings: 6005-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6005 units.",
      "Never mix components between two 6005-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6005-NSK.",
      "The open 6005 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 25 mm bore puts 6005 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6005 at 11.1 kN dynamic (C) and 5.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 79 g, 6005 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×47×12 mm envelope of 6005 gives a D/d ratio of 1.88 and 11.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 11.1/5.85 kN load ratings, mass 79 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6005 on the 25×47×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6005 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6005 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6005-NSK bearing?",
        "a": "A 6005-NSK deep-groove ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6005-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6005-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6005 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6005-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6005?",
        "a": "NSK lists the open 6005 under the bare designation 6005; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6005?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6005-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6005-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6005",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×47×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6005",
      "NSK 6005",
      "6005-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6006DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.6,
    "static_load_kN": 8.3,
    "weight_g": 116,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6006-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6006DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6006-2RS-NSK.",
      "Choosing the 60xx extra-light section saves radial space at 30 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6206 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6006-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6006-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6006-2RS-NSK drags the lip and overheats it.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6006-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6006DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 30 mm bore puts 6006 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6006 at 14.6 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 116 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 14.6/8.3 kN load ratings, mass 116 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6006DDU on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6006; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006-2RS-NSK bearing?",
        "a": "A 6006-2RS-NSK deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6006 bore code work?",
        "a": "The last two digits of 6006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6006-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6006?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6006DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×55×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6006 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006-2RS",
      "6006-2rs",
      "6006DDU",
      "NSK 6006DDU",
      "6006-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6006VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.6,
    "static_load_kN": 8.3,
    "weight_g": 116,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6006-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6006VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The low-drag lip of 6006-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6006-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6006-RSR-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6006VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 30 mm bore puts 6006 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6006 at 14.6 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 116 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 14.6/8.3 kN load ratings, mass 116 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6006VV on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6006 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6006; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006-RSR-NSK bearing?",
        "a": "A 6006-RSR-NSK deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6006-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6006-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6006 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6006-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6006?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6006VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×55×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6006VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006-RSR",
      "6006-rsr",
      "6006VV",
      "NSK 6006VV",
      "6006-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6006ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.6,
    "static_load_kN": 8.3,
    "weight_g": 116,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6006ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6006-ZZ-NSK.",
      "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6006-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6006-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006-ZZ-NSK.",
      "NSK catalogues the shielded version as 6006ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 30 mm bore puts 6006 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6006 at 14.6 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 116 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 14.6/8.3 kN load ratings, mass 116 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6006ZZ on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6006; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006-ZZ-NSK bearing?",
        "a": "A 6006-ZZ-NSK deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 30 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (55×13 mm, 12.5 mm radial section) at 30 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6006 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6006 uses the same ISO 15 envelope (30×55×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6006?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6006ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×55×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6006 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006-ZZ",
      "6006-zz",
      "6006ZZ",
      "NSK 6006ZZ",
      "6006-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6006",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6006",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.6,
    "static_load_kN": 8.3,
    "weight_g": 116,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6006 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 55 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6006 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 60xx extra-light section at 30 mm bore uses a smaller 55 mm OD than a 6206; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6006 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×55×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6006 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6006.",
      "The housing bore for the 55 mm OD should be round within IT7; an oval bore pinches the outer ring of 6006 and shows up later as two-point loaded raceway wear.",
      "The open 6006 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 30 mm bore puts 6006 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6006 at 14.6 kN dynamic (C) and 8.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 116 g, 6006 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×55×13 mm envelope of 6006 gives a D/d ratio of 1.83 and 12.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 14.6/8.3 kN load ratings, mass 116 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6006 on the 30×55×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6006 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6006 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6006; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6006 bearing?",
        "a": "A 6006 deep-groove ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6006 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6006 need?",
        "a": "The open 6006 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6006?",
        "a": "NSK lists the open 6006 under the bare designation 6006; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6006 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6006-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6006-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6006",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×55×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6006",
      "NSK 6006"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6007DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 10.3,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6007-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6007DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6007 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6007-2RS-NSK runs slower and cooler-limited than the open 6007; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6007-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6007DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 35 mm bore puts 6007 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.6 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 151 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 17.6/10.3 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6007DDU on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6007; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-2RS-NSK bearing?",
        "a": "A 6007-2RS-NSK deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6007-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6007-2RS-NSK need?",
        "a": "6007-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6007 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6007?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6007DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×62×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6007DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007-2RS",
      "6007-2rs",
      "6007DDU",
      "NSK 6007DDU",
      "6007-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6007VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 10.3,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6007-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6007VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007-RSR-NSK.",
      "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.",
      "RSR low-friction seals on 6007-RSR-NSK run faster than contact-seal 6007-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6007-2RS instead.",
      "The non-contact lip of 6007-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.",
      "The housing bore for the 62 mm OD should be round within IT7; an oval bore pinches the outer ring of 6007-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6007-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6007VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 35 mm bore puts 6007 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.6 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 151 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 17.6/10.3 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6007VV on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6007; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6007 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-RSR-NSK bearing?",
        "a": "A 6007-RSR-NSK deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6007-RSR-NSK need?",
        "a": "6007-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6007 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6007 bore code work?",
        "a": "The last two digits of 6007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6007?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6007VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×62×14 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6007VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007-RSR",
      "6007-rsr",
      "6007VV",
      "NSK 6007VV",
      "6007-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6007ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 10.3,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6007ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6007-ZZ-NSK.",
      "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.",
      "Do not wash 6007-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6007-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 6007-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6007ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 35 mm bore puts 6007 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.6 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 151 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 17.6/10.3 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6007ZZ on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6007 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6007; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-ZZ-NSK bearing?",
        "a": "A 6007-ZZ-NSK deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6007 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6007 uses the same ISO 15 envelope (35×62×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6007-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6007-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6007 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6007?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6007ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×62×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6007ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007-ZZ",
      "6007-zz",
      "6007ZZ",
      "NSK 6007ZZ",
      "6007-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6007-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6007",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 10.3,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6007 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 62 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6007 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 35 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6207 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6007-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6007 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6007-NSK.",
      "The open 6007 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 35 mm bore puts 6007 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.6 kN dynamic load rating (C) and 10.3 kN static (C0), 6007 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 151 g, 6007 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×62×14 mm envelope of 6007 gives a D/d ratio of 1.77 and 13.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 17.6/10.3 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6007 on the 35×62×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6007 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6007 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6007-NSK bearing?",
        "a": "A 6007-NSK deep-groove ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6007-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6007-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6007 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6007-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6007?",
        "a": "NSK lists the open 6007 under the bare designation 6007; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6007?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6007-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6007-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6007",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×62×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6007",
      "NSK 6007",
      "6007-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6008DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 18.4,
    "static_load_kN": 11.5,
    "weight_g": 190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6008-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6008DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6008-2RS-NSK runs slower and cooler-limited than the open 6008; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6008-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 6008-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6008-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6008DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 40 mm bore puts 6008 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 18.4 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 190 g, 6008 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 18.4/11.5 kN load ratings, mass 190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6008DDU on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-2RS-NSK bearing?",
        "a": "A 6008-2RS-NSK deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6008-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 40 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6008?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6008DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×68×15 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6008DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008-2RS",
      "6008-2rs",
      "6008DDU",
      "NSK 6008DDU",
      "6008-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6008VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 18.4,
    "static_load_kN": 11.5,
    "weight_g": 190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6008VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6008-RSR-NSK.",
      "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.",
      "RSR low-friction seals on 6008-RSR-NSK run faster than contact-seal 6008-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6008-2RS instead.",
      "The low-drag lip of 6008-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 68 mm OD should be round within IT7; an oval bore pinches the outer ring of 6008-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6008VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 40 mm bore puts 6008 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 18.4 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 190 g, 6008 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 18.4/11.5 kN load ratings, mass 190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6008VV on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-RSR-NSK bearing?",
        "a": "A 6008-RSR-NSK deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6008-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6008-RSR-NSK need?",
        "a": "6008-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6008 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6008?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6008VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×68×15 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6008VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008-RSR",
      "6008-rsr",
      "6008VV",
      "NSK 6008VV",
      "6008-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6008ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 18.4,
    "static_load_kN": 11.5,
    "weight_g": 190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6008-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6008ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-ZZ-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 60xx extra-light section at 40 mm bore uses a smaller 68 mm OD than a 6208; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6008-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6008-2RS for that.",
      "Shielded 6008-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6008ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 40 mm bore puts 6008 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 18.4 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 190 g, 6008 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 18.4/11.5 kN load ratings, mass 190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6008ZZ on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-ZZ-NSK bearing?",
        "a": "A 6008-ZZ-NSK deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6008-ZZ-NSK need?",
        "a": "6008-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6008 bore code work?",
        "a": "The last two digits of 6008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6008?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6008ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×68×15 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6008ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008-ZZ",
      "6008-zz",
      "6008ZZ",
      "NSK 6008ZZ",
      "6008-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6008-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6008",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 18.4,
    "static_load_kN": 11.5,
    "weight_g": 190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6008 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 68 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6008-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Choosing the 60xx extra-light section saves radial space at 40 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6208 before committing to the smaller envelope.",
      "The open 6008-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 40×68×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6008-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 15 mm-wide ring of 6008-NSK drags the lip and overheats it.",
      "The housing bore for the 68 mm OD should be round within IT7; an oval bore pinches the outer ring of 6008-NSK and shows up later as two-point loaded raceway wear.",
      "The open 6008 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 40 mm bore puts 6008 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 18.4 kN dynamic load rating (C) and 11.5 kN static (C0), 6008 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 190 g, 6008 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×68×15 mm envelope of 6008 gives a D/d ratio of 1.70 and 14.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 18.4/11.5 kN load ratings, mass 190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6008 on the 40×68×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6008 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6008; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6008-NSK bearing?",
        "a": "A 6008-NSK deep-groove ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6008 mean?",
        "a": "A bare 6008 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6000 compare with other series at the same 40 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (68×15 mm, 14.0 mm radial section) at 40 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK order number for an open 6008?",
        "a": "NSK lists the open 6008 under the bare designation 6008; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6008 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6008-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6008-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6008",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×68×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6008",
      "NSK 6008",
      "6008-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6009-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6009DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 75,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23,
    "static_load_kN": 15.2,
    "weight_g": 241,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6009-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6009DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 60xx extra-light section at 45 mm bore uses a smaller 75 mm OD than a 6209; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6009-2RS-NSK runs slower and cooler-limited than the open 6009; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6009-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 75 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6009-2RS-NSK.",
      "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6009DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 45 mm bore puts 6009 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 23 kN dynamic load rating (C) and 15.2 kN static (C0), 6009 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 241 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 23/15.2 kN load ratings, mass 241 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6009DDU on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6009; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6009-2RS-NSK bearing?",
        "a": "A 6009-2RS-NSK deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6009-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6009-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6009 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6009-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6009?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6009DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×75×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6009 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6009-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6009-2RS",
      "6009-2rs",
      "6009DDU",
      "NSK 6009DDU",
      "6009-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6009-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6009VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 75,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23,
    "static_load_kN": 15.2,
    "weight_g": 241,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6009-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6009VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6009-RSR.",
      "Choosing the 60xx extra-light section saves radial space at 45 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6209 before committing to the smaller envelope.",
      "RSR low-friction seals on 6009-RSR run faster than contact-seal 6009-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6009-2RS instead.",
      "The non-contact lip of 6009-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6009-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6009VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 45 mm bore puts 6009 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 23 kN dynamic load rating (C) and 15.2 kN static (C0), 6009 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 241 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 23/15.2 kN load ratings, mass 241 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6009VV on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6009-RSR bearing?",
        "a": "A 6009-RSR deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6009 bore code work?",
        "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6009-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6009?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6009VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×75×16 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6009VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6009-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6009-RSR",
      "6009-rsr",
      "6009VV",
      "NSK 6009VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6009-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6009ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 75,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23,
    "static_load_kN": 15.2,
    "weight_g": 241,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6009-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 75 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6009ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6009-ZZ-NSK.",
      "Choosing the 60xx extra-light section saves radial space at 45 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6209 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6009-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6009-2RS for that.",
      "Shielded 6009-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6009-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6009ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 45 mm bore puts 6009 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 23 kN dynamic load rating (C) and 15.2 kN static (C0), 6009 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 241 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 23/15.2 kN load ratings, mass 241 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6009ZZ on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6009; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6009-ZZ-NSK bearing?",
        "a": "A 6009-ZZ-NSK deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 45 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (75×16 mm, 15.0 mm radial section) at 45 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6009 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6009 uses the same ISO 15 envelope (45×75×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6009?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6009ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×75×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6009 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6009-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6009-ZZ",
      "6009-zz",
      "6009ZZ",
      "NSK 6009ZZ",
      "6009-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6009-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6009",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 75,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 23,
    "static_load_kN": 15.2,
    "weight_g": 241,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6009 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Choosing the 60xx extra-light section saves radial space at 45 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6209 before committing to the smaller envelope.",
      "The open 6009-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 45×75×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6009 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6009 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 45 mm bore puts 6009 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 23 kN dynamic load rating (C) and 15.2 kN static (C0), 6009 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 241 g, 6009 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×75×16 mm envelope of 6009 gives a D/d ratio of 1.67 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 23/15.2 kN load ratings, mass 241 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6009 on the 45×75×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6009 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6009; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6009-NSK bearing?",
        "a": "A 6009-NSK deep-groove ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6009 bore code work?",
        "a": "The last two digits of 6009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6009 mean?",
        "a": "A bare 6009 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 6009?",
        "a": "NSK lists the open 6009 under the bare designation 6009; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 45 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6009 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6009-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6009-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6009",
      "NSK 6009",
      "6009-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6010-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6010DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 80,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 24,
    "static_load_kN": 16.6,
    "weight_g": 261,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6010DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6010-2RS-NSK runs slower and cooler-limited than the open 6010; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6010-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6010-2RS-NSK.",
      "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6010DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 50 mm bore puts 6010 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 24 kN dynamic load rating (C) and 16.6 kN static (C0), 6010 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 24/16.6 kN load ratings, mass 261 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6010DDU on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6010; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6010-2RS-NSK bearing?",
        "a": "A 6010-2RS-NSK deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6010-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 50 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6010?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6010DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×80×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6010DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6010-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6010-2RS",
      "6010-2rs",
      "6010DDU",
      "NSK 6010DDU",
      "6010-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6010-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6010VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 80,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 24,
    "static_load_kN": 16.6,
    "weight_g": 261,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6010-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 80 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6010VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.",
      "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.",
      "The low-drag lip of 6010-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6010-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-RSR-NSK-C3. No clearance suffix means normal CN clearance.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6010VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 50 mm bore puts 6010 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 24 kN dynamic load rating (C) and 16.6 kN static (C0), 6010 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 24/16.6 kN load ratings, mass 261 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6010VV on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6010; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6010-RSR-NSK bearing?",
        "a": "A 6010-RSR-NSK deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6010-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6010-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6010 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6010-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6010?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6010VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×80×16 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6010VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6010-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6010-RSR",
      "6010-rsr",
      "6010VV",
      "NSK 6010VV",
      "6010-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6010-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6010ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 80,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 24,
    "static_load_kN": 16.6,
    "weight_g": 261,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6010ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6010 with C3 for those conditions.",
      "The 60xx extra-light section at 50 mm bore uses a smaller 80 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6010-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6010-2RS for that.",
      "Do not wash 6010-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 6010-ZZ-NSK drags the lip and overheats it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6010ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 50 mm bore puts 6010 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 24 kN dynamic load rating (C) and 16.6 kN static (C0), 6010 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 24/16.6 kN load ratings, mass 261 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6010ZZ on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6010-ZZ-NSK bearing?",
        "a": "A 6010-ZZ-NSK deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6010 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6010 uses the same ISO 15 envelope (50×80×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6010-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6010-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6010 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6010?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6010ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×80×16 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6010ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6010-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6010-ZZ",
      "6010-zz",
      "6010ZZ",
      "NSK 6010ZZ",
      "6010-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6010-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6010",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 80,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 24,
    "static_load_kN": 16.6,
    "weight_g": 261,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6010 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 50 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.",
      "The open 6010-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 50×80×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6010 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6010-NSK-C3. No clearance suffix means normal CN clearance.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6010 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 50 mm bore puts 6010 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 24 kN dynamic load rating (C) and 16.6 kN static (C0), 6010 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 261 g, 6010 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×80×16 mm envelope of 6010 gives a D/d ratio of 1.60 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 24/16.6 kN load ratings, mass 261 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6010 on the 50×80×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6010 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6010; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6010-NSK bearing?",
        "a": "A 6010-NSK deep-groove ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 50 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (80×16 mm, 15.0 mm radial section) at 50 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6010 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6010 uses the same ISO 15 envelope (50×80×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6010?",
        "a": "NSK lists the open 6010 under the bare designation 6010; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 50 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6010?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6010-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6010-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6010-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×80×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6010",
      "NSK 6010",
      "6010-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6011DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 21.2,
    "weight_g": 381,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6011DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6011 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6011-2RS-NSK runs slower and cooler-limited than the open 6011; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6011-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6011-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6011DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 55 mm bore 6011 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 381 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 31/21.2 kN load ratings, mass 381 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6011DDU on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6011 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6011; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-2RS-NSK bearing?",
        "a": "A 6011-2RS-NSK deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6011-2RS-NSK need?",
        "a": "6011-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6011 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6011 bore code work?",
        "a": "The last two digits of 6011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6011?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6011DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×90×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6011DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011-2RS",
      "6011-2rs",
      "6011DDU",
      "NSK 6011DDU",
      "6011-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6011VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 21.2,
    "weight_g": 381,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6011VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6011 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 55 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6211 before committing to the smaller envelope.",
      "RSR low-friction seals on 6011-RSR run faster than contact-seal 6011-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6011-2RS instead.",
      "The low-drag lip of 6011-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6011-RSR drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6011VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 55 mm bore 6011 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 381 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 31/21.2 kN load ratings, mass 381 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6011VV on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6011; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-RSR bearing?",
        "a": "A 6011-RSR deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6011 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6011 uses the same ISO 15 envelope (55×90×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6011-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6011-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6011 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6011?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6011VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×90×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6011VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011-RSR",
      "6011-rsr",
      "6011VV",
      "NSK 6011VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6011ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 21.2,
    "weight_g": 381,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6011-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6011ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6011 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6011-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6011-2RS for that.",
      "Do not wash 6011-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6011ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 55 mm bore 6011 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 381 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 31/21.2 kN load ratings, mass 381 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6011ZZ on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6011 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-ZZ-NSK bearing?",
        "a": "A 6011-ZZ-NSK deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6011-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 55 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (90×18 mm, 17.5 mm radial section) at 55 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6011?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6011ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×90×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6011ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011-ZZ",
      "6011-zz",
      "6011ZZ",
      "NSK 6011ZZ",
      "6011-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6011-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6011",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 21.2,
    "weight_g": 381,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6011 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 90 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6011 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 55 mm bore uses a smaller 90 mm OD than a 6211; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6011-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 55×90×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6011-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6011 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 55 mm bore 6011 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 21.2 kN static (C0), 6011 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 381 g, 6011 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×90×18 mm envelope of 6011 gives a D/d ratio of 1.64 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 31/21.2 kN load ratings, mass 381 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6011 on the 55×90×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6011 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6011 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6011-NSK bearing?",
        "a": "A 6011-NSK deep-groove ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6011-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6011-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6011 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6011-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6011?",
        "a": "NSK lists the open 6011 under the bare designation 6011; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6011 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6011-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6011-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×90×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6011",
      "NSK 6011",
      "6011-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6012-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6012DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 95,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 23.2,
    "weight_g": 412,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6012DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6012 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6012-2RS-NSK runs slower and cooler-limited than the open 6012; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6012-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 95 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6012-2RS-NSK.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6012DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 60 mm bore 6012 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 6012 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 412 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 32.5/23.2 kN load ratings, mass 412 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6012DDU on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6012-2RS-NSK bearing?",
        "a": "A 6012-2RS-NSK deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6012-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6012-2RS-NSK need?",
        "a": "6012-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6012 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6012?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6012DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×95×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6012DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6012-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6012-2RS",
      "6012-2rs",
      "6012DDU",
      "NSK 6012DDU",
      "6012-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6012-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6012VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 95,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 23.2,
    "weight_g": 412,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6012-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6012VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6012 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.",
      "RSR low-friction seals on 6012-RSR-NSK run faster than contact-seal 6012-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6012-2RS instead.",
      "The non-contact lip of 6012-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6012-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6012VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 60 mm bore 6012 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 6012 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 412 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 32.5/23.2 kN load ratings, mass 412 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6012VV on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6012-RSR-NSK bearing?",
        "a": "A 6012-RSR-NSK deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6012-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6012-RSR-NSK need?",
        "a": "6012-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6012 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6012?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6012VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×95×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6012VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6012-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6012-RSR",
      "6012-rsr",
      "6012VV",
      "NSK 6012VV",
      "6012-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6012-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6012ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 95,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 23.2,
    "weight_g": 412,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6012-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 95 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6012ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6012 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 60 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6012-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6012-2RS for that.",
      "Shielded 6012-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Vibration during standstill brinells the raceways of a 60 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6012ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 60 mm bore 6012 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 6012 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 412 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 32.5/23.2 kN load ratings, mass 412 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6012ZZ on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6012; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6012-ZZ-NSK bearing?",
        "a": "A 6012-ZZ-NSK deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6012-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6012-ZZ-NSK need?",
        "a": "6012-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6012?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6012ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×95×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6012ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6012-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6012-ZZ",
      "6012-zz",
      "6012ZZ",
      "NSK 6012ZZ",
      "6012-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6012-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6012",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 95,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 23.2,
    "weight_g": 412,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6012 with C3 clearance and re-check the residual value after mounting.",
      "The 60xx extra-light section at 60 mm bore uses a smaller 95 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Storage matters for open bearings: 6012-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6012 units.",
      "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6012 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 60 mm bore 6012 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32.5 kN dynamic load rating (C) and 23.2 kN static (C0), 6012 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 412 g, 6012 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×95×18 mm envelope of 6012 gives a D/d ratio of 1.58 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 32.5/23.2 kN load ratings, mass 412 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6012 on the 60×95×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6012 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6012 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6012-NSK bearing?",
        "a": "A 6012-NSK deep-groove ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6012 mean?",
        "a": "A bare 6012 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6000 compare with other series at the same 60 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (95×18 mm, 17.5 mm radial section) at 60 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK order number for an open 6012?",
        "a": "NSK lists the open 6012 under the bare designation 6012; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 60 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6012 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6012-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6012-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×95×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6012",
      "NSK 6012",
      "6012-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6013-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6013DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 33.5,
    "static_load_kN": 25.2,
    "weight_g": 439,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6013DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6013 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6013-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6013-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6013-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6013DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 65 mm bore 6013 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 33.5 kN dynamic load rating (C) and 25.2 kN static (C0), 6013 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 439 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 33.5/25.2 kN load ratings, mass 439 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6013DDU on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6013; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6013 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6013-2RS-NSK bearing?",
        "a": "A 6013-2RS-NSK deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6013-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6013-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6013 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6013-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6013?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6013DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×100×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6013DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6013-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6013-2RS",
      "6013-2rs",
      "6013DDU",
      "NSK 6013DDU",
      "6013-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6013-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6013VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 33.5,
    "static_load_kN": 25.2,
    "weight_g": 439,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6013VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.",
      "The 60xx extra-light section at 65 mm bore uses a smaller 100 mm OD than a 6213; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The low-drag lip of 6013-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6013-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.",
      "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6013-RSR and shows up later as two-point loaded raceway wear.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 6013-RSR drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6013VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 65 mm bore 6013 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 33.5 kN dynamic load rating (C) and 25.2 kN static (C0), 6013 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 439 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 33.5/25.2 kN load ratings, mass 439 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6013VV on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6013-RSR bearing?",
        "a": "A 6013-RSR deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6013-RSR need?",
        "a": "6013-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6013 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6013 bore code work?",
        "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6013?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6013VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×100×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6013VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6013-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6013-RSR",
      "6013-rsr",
      "6013VV",
      "NSK 6013VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6013-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6013ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 33.5,
    "static_load_kN": 25.2,
    "weight_g": 439,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6013-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6013ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6013 with C3 clearance and re-check the residual value after mounting.",
      "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6013-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6013-2RS for that.",
      "Shielded 6013-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6013-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6013ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 65 mm bore 6013 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 33.5 kN dynamic load rating (C) and 25.2 kN static (C0), 6013 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 439 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 33.5/25.2 kN load ratings, mass 439 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6013ZZ on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6013-ZZ-NSK bearing?",
        "a": "A 6013-ZZ-NSK deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6013-ZZ-NSK need?",
        "a": "6013-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6013 bore code work?",
        "a": "The last two digits of 6013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6013?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6013ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×100×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6013 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6013-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6013-ZZ",
      "6013-zz",
      "6013ZZ",
      "NSK 6013ZZ",
      "6013-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6013-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6013",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 33.5,
    "static_load_kN": 25.2,
    "weight_g": 439,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6013 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 100 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6013 with C3 for those conditions.",
      "Choosing the 60xx extra-light section saves radial space at 65 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6213 before committing to the smaller envelope.",
      "The open 6013-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 65×100×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6013 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6013 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 65 mm bore 6013 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 33.5 kN dynamic load rating (C) and 25.2 kN static (C0), 6013 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 439 g, 6013 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×100×18 mm envelope of 6013 gives a D/d ratio of 1.54 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 33.5/25.2 kN load ratings, mass 439 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6013 on the 65×100×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6013 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6013-NSK bearing?",
        "a": "A 6013-NSK deep-groove ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 65 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (100×18 mm, 17.5 mm radial section) at 65 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6013 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6013 uses the same ISO 15 envelope (65×100×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6013?",
        "a": "NSK lists the open 6013 under the bare designation 6013; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 65 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6013?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6013-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6013-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×100×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6013",
      "NSK 6013",
      "6013-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6014-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6014DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 110,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 31,
    "weight_g": 608,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6014DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.",
      "Heat is the enemy of the sealed 6014-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6014-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6014DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 70 mm bore 6014 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6014 at 42 kN dynamic (C) and 31 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 608 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 42/31 kN load ratings, mass 608 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6014DDU on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6014 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6014-2RS-NSK bearing?",
        "a": "A 6014-2RS-NSK deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6014-2RS-NSK need?",
        "a": "6014-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6014 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6014 bore code work?",
        "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6014?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6014DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×110×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6014DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6014-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6014-2RS",
      "6014-2rs",
      "6014DDU",
      "NSK 6014DDU",
      "6014-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6014-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6014VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 110,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 31,
    "weight_g": 608,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6014-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6014VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.",
      "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.",
      "RSR low-friction seals on 6014-RSR run faster than contact-seal 6014-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6014-2RS instead.",
      "The low-drag lip of 6014-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6014VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 70 mm bore 6014 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6014 at 42 kN dynamic (C) and 31 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 608 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 42/31 kN load ratings, mass 608 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6014VV on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6014-RSR bearing?",
        "a": "A 6014-RSR deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6014 bore code work?",
        "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6014-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6014?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6014VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×110×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6014VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6014-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6014-RSR",
      "6014-rsr",
      "6014VV",
      "NSK 6014VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6014-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6014ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 110,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 31,
    "weight_g": 608,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6014-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6014ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6014 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 70 mm bore uses a smaller 110 mm OD than a 6214; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6014-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6014-2RS for that.",
      "Shielded 6014-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6014ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 70 mm bore 6014 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6014 at 42 kN dynamic (C) and 31 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 608 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 42/31 kN load ratings, mass 608 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6014ZZ on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6014-ZZ-NSK bearing?",
        "a": "A 6014-ZZ-NSK deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6014 bore code work?",
        "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6014-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6014?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6014ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×110×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6014ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6014-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6014-ZZ",
      "6014-zz",
      "6014ZZ",
      "NSK 6014ZZ",
      "6014-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6014-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6014",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 110,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 31,
    "weight_g": 608,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6014 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 110 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6014 with C3 for those conditions.",
      "Choosing the 60xx extra-light section saves radial space at 70 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6214 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6014-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6014 units.",
      "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6014-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6014-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6014 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 70 mm bore 6014 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6014 at 42 kN dynamic (C) and 31 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 608 g, 6014 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×110×20 mm envelope of 6014 gives a D/d ratio of 1.57 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 42/31 kN load ratings, mass 608 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6014 on the 70×110×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6014 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6014; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6014-NSK bearing?",
        "a": "A 6014-NSK deep-groove ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6014-NSK need?",
        "a": "The open 6014-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6014 bore code work?",
        "a": "The last two digits of 6014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6014?",
        "a": "NSK lists the open 6014 under the bare designation 6014; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 70 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6014 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6014-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6014-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×110×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6014",
      "NSK 6014",
      "6014-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6015-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6015DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 115,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 33.5,
    "weight_g": 649,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6015DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6015-2RS-NSK runs slower and cooler-limited than the open 6015; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6015-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "The housing bore for the 115 mm OD should be round within IT7; an oval bore pinches the outer ring of 6015-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6015-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6015DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 75 mm bore 6015 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6015 at 43.5 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 43.5/33.5 kN load ratings, mass 649 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6015DDU on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6015-2RS-NSK bearing?",
        "a": "A 6015-2RS-NSK deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6015-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 75 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6015?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6015DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×115×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6015DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6015-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6015-2RS",
      "6015-2rs",
      "6015DDU",
      "NSK 6015DDU",
      "6015-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6015-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6015VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 115,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 33.5,
    "weight_g": 649,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6015-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 115 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6015VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6015-RSR-NSK run faster than contact-seal 6015-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6015-2RS instead.",
      "The low-drag lip of 6015-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6015VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 75 mm bore 6015 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6015 at 43.5 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 43.5/33.5 kN load ratings, mass 649 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6015VV on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6015; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6015 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6015-RSR-NSK bearing?",
        "a": "A 6015-RSR-NSK deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6015-RSR-NSK need?",
        "a": "6015-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6015 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6015 bore code work?",
        "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6015?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6015VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×115×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6015VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6015-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6015-RSR",
      "6015-rsr",
      "6015VV",
      "NSK 6015VV",
      "6015-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6015-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6015ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 115,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 33.5,
    "weight_g": 649,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6015ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Choosing the 60xx extra-light section saves radial space at 75 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6015-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6015-2RS for that.",
      "Shielded 6015-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6015ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 75 mm bore 6015 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6015 at 43.5 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 43.5/33.5 kN load ratings, mass 649 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6015ZZ on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6015-ZZ-NSK bearing?",
        "a": "A 6015-ZZ-NSK deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6015-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 75 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (115×20 mm, 20.0 mm radial section) at 75 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6015?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6015ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×115×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6015ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6015-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6015-ZZ",
      "6015-zz",
      "6015ZZ",
      "NSK 6015ZZ",
      "6015-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6015-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6015",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 115,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 33.5,
    "weight_g": 649,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6015 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 60xx extra-light section at 75 mm bore uses a smaller 115 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6015-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 75×115×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6015-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6015 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 75 mm bore 6015 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6015 at 43.5 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 649 g, 6015 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×115×20 mm envelope of 6015 gives a D/d ratio of 1.53 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 43.5/33.5 kN load ratings, mass 649 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6015 on the 75×115×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6015 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6015; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6015-NSK bearing?",
        "a": "A 6015-NSK deep-groove ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6015-NSK need?",
        "a": "The open 6015-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6015 bore code work?",
        "a": "The last two digits of 6015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6015?",
        "a": "NSK lists the open 6015 under the bare designation 6015; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 75 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6015 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6015-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6015-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×115×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6015",
      "NSK 6015",
      "6015-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6016-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6016DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 125,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 40,
    "weight_g": 872,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6016DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 6016 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6016-2RS-NSK runs slower and cooler-limited than the open 6016; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6016-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 80 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6016DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 80 mm bore 6016 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6016 at 52.5 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 872 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 52.5/40 kN load ratings, mass 872 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6016DDU on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6016 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6016-2RS-NSK bearing?",
        "a": "A 6016-2RS-NSK deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6000 compare with other series at the same 80 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6016 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6016?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6016DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×125×22 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6016DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6016-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6016-2RS",
      "6016-2rs",
      "6016DDU",
      "NSK 6016DDU",
      "6016-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6016-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6016VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 125,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 40,
    "weight_g": 872,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6016VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 80 mm of 6016-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 80 mm bore uses a smaller 125 mm OD than a 6216; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6016-RSR run faster than contact-seal 6016-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6016-2RS instead.",
      "The non-contact lip of 6016-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6016-RSR drags the lip and overheats it.",
      "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6016VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 80 mm bore 6016 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6016 at 52.5 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 872 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 52.5/40 kN load ratings, mass 872 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6016VV on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6016; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6016-RSR bearing?",
        "a": "A 6016-RSR deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6000 compare with other series at the same 80 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6016 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6016?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6016VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×125×22 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6016VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6016-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6016-RSR",
      "6016-rsr",
      "6016VV",
      "NSK 6016VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6016-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6016ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 125,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 40,
    "weight_g": 872,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6016-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 125 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6016ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6016-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6016-2RS for that.",
      "Shielded 6016-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6016ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 80 mm bore 6016 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6016 at 52.5 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 872 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 52.5/40 kN load ratings, mass 872 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6016ZZ on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6016 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6016-ZZ-NSK bearing?",
        "a": "A 6016-ZZ-NSK deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 80 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (125×22 mm, 22.5 mm radial section) at 80 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6016 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6016 uses the same ISO 15 envelope (80×125×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6016?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6016ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×125×22 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6016ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6016-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6016-ZZ",
      "6016-zz",
      "6016ZZ",
      "NSK 6016ZZ",
      "6016-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6016-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6016",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 125,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 40,
    "weight_g": 872,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 80 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6216 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6016-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6016 units.",
      "Never mix components between two 6016-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6016-NSK drags the lip and overheats it.",
      "The open 6016 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 80 mm bore 6016 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6016 at 52.5 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 872 g, 6016 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×125×22 mm envelope of 6016 gives a D/d ratio of 1.56 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 52.5/40 kN load ratings, mass 872 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6016 on the 80×125×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6016 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6016-NSK bearing?",
        "a": "A 6016-NSK deep-groove ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6016-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6016-NSK need?",
        "a": "The open 6016-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6016?",
        "a": "NSK lists the open 6016 under the bare designation 6016; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 80 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6016?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6016-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6016-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6016",
      "NSK 6016",
      "6016-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6017-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6017DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 130,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 54.5,
    "static_load_kN": 43,
    "weight_g": 918,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6017DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 85 mm bore the ring mass is significant: heat 6017 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6017-2RS-NSK runs slower and cooler-limited than the open 6017; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6017-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6017-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6017-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6017DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 85 mm bore 6017 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6017 at 54.5 kN dynamic (C) and 43 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 918 g, 6017 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×130×22 mm envelope of 6017 gives a D/d ratio of 1.53 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 54.5/43 kN load ratings, mass 918 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6017DDU on the 85×130×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6017 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6017; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6017-2RS-NSK bearing?",
        "a": "A 6017-2RS-NSK deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6017 bore code work?",
        "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6017-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6017?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6017DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×130×22 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6017 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6017",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6017-2RS",
      "6017-2rs",
      "6017DDU",
      "NSK 6017DDU",
      "6017-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6017-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6017VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 130,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 54.5,
    "static_load_kN": 43,
    "weight_g": 918,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6017VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 85 mm of 6017-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 85 mm bore uses a smaller 130 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6017-RSR run faster than contact-seal 6017-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6017-2RS instead.",
      "The low-drag lip of 6017-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6017VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 85 mm bore 6017 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6017 at 54.5 kN dynamic (C) and 43 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 918 g, 6017 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×130×22 mm envelope of 6017 gives a D/d ratio of 1.53 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 54.5/43 kN load ratings, mass 918 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6017VV on the 85×130×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6017 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6017-RSR bearing?",
        "a": "A 6017-RSR deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6017-RSR need?",
        "a": "6017-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6017 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6017 bore code work?",
        "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6017?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6017VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×130×22 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6017VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6017",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6017-RSR",
      "6017-rsr",
      "6017VV",
      "NSK 6017VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6017-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6017ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 130,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 54.5,
    "static_load_kN": 43,
    "weight_g": 918,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6017-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 130 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6017ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 85 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6217 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6017-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6017-2RS for that.",
      "Shielded 6017-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6017ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 85 mm bore 6017 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6017 at 54.5 kN dynamic (C) and 43 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 918 g, 6017 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×130×22 mm envelope of 6017 gives a D/d ratio of 1.53 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 54.5/43 kN load ratings, mass 918 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6017ZZ on the 85×130×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6017 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6017 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6017-ZZ-NSK bearing?",
        "a": "A 6017-ZZ-NSK deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6017 bore code work?",
        "a": "The last two digits of 6017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6017-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6017?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6017ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×130×22 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6017ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6017",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6017-ZZ",
      "6017-zz",
      "6017ZZ",
      "NSK 6017ZZ",
      "6017-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6017-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6017",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 130,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 54.5,
    "static_load_kN": 43,
    "weight_g": 918,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 85 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6217 before committing to the smaller envelope.",
      "The open 6017-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 85×130×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6017-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6017-NSK.",
      "The open 6017 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 85 mm bore 6017 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6017 at 54.5 kN dynamic (C) and 43 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 918 g, 6017 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×130×22 mm envelope of 6017 gives a D/d ratio of 1.53 and 22.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 54.5/43 kN load ratings, mass 918 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6017 on the 85×130×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6017 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6017 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6017-NSK bearing?",
        "a": "A 6017-NSK deep-groove ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6017 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6017 uses the same ISO 15 envelope (85×130×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6017-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6017-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6017 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6017?",
        "a": "NSK lists the open 6017 under the bare designation 6017; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 85 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6017 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6017",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6017-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6017",
      "NSK 6017",
      "6017-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6018-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6018DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 140,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 50,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6018-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6018DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 6018-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6018-2RS-NSK runs slower and cooler-limited than the open 6018; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6018-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6018-2RS-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6018-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6018DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 90 mm bore 6018 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6018 at 64 kN dynamic (C) and 50 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1190 g (1.2 kg), 6018 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×140×24 mm envelope of 6018 gives a D/d ratio of 1.56 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 64/50 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6018DDU on the 90×140×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6018 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6018 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6018; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6018-2RS-NSK bearing?",
        "a": "A 6018-2RS-NSK deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6018 bore code work?",
        "a": "The last two digits of 6018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6018-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6018?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6018DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×140×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6018DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6018",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6018-2RS",
      "6018-2rs",
      "6018DDU",
      "NSK 6018DDU",
      "6018-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6018-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6018VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 140,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 50,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6018-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 140 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6018VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 6018-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The low-drag lip of 6018-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6018-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6018-RSR drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6018VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 90 mm bore 6018 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6018 at 64 kN dynamic (C) and 50 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1190 g (1.2 kg), 6018 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×140×24 mm envelope of 6018 gives a D/d ratio of 1.56 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 64/50 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6018VV on the 90×140×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6018 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6018 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6018-RSR bearing?",
        "a": "A 6018-RSR deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6018-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6000 compare with other series at the same 90 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (140×24 mm, 25.0 mm radial section) at 90 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6018?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6018VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×140×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6018 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6018",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6018-RSR",
      "6018-rsr",
      "6018VV",
      "NSK 6018VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6018-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6018ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 140,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 50,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6018ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 6018-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6018-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6018-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6018-ZZ-NSK.",
      "NSK catalogues the shielded version as 6018ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 90 mm bore 6018 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6018 at 64 kN dynamic (C) and 50 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1190 g (1.2 kg), 6018 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×140×24 mm envelope of 6018 gives a D/d ratio of 1.56 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 64/50 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6018ZZ on the 90×140×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6018 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6018-ZZ-NSK bearing?",
        "a": "A 6018-ZZ-NSK deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6018 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6018 uses the same ISO 15 envelope (90×140×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6018-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6018-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6018 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6018?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6018ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×140×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6018 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6018",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6018-ZZ",
      "6018-zz",
      "6018ZZ",
      "NSK 6018ZZ",
      "6018-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6018-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6018",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 140,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 64,
    "static_load_kN": 50,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 6018 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 90 mm bore uses a smaller 140 mm OD than a 6218; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6018-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 90×140×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6018 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6018-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6018-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6018 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 90 mm bore 6018 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6018 at 64 kN dynamic (C) and 50 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1190 g (1.2 kg), 6018 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×140×24 mm envelope of 6018 gives a D/d ratio of 1.56 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 64/50 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6018 on the 90×140×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6018 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6018 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6018-NSK bearing?",
        "a": "A 6018-NSK deep-groove ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6018-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6018-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6018 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6018-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6018?",
        "a": "NSK lists the open 6018 under the bare designation 6018; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 90 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6018 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6018",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6018-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×140×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6018",
      "NSK 6018",
      "6018-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6019-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6019DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 145,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66.5,
    "static_load_kN": 54,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6019-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 145 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6019DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 6019-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6019-2RS-NSK runs slower and cooler-limited than the open 6019; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6019-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6019DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 95 mm bore 6019 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6019 at 66.5 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 6019 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×145×24 mm envelope of 6019 gives a D/d ratio of 1.53 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66.5/54 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6019DDU on the 95×145×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6019 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6019 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6019-2RS-NSK bearing?",
        "a": "A 6019-2RS-NSK deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6019 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6019 uses the same ISO 15 envelope (95×145×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6019-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6019-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6019 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6019?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6019DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×145×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6019 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6019",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6019-2RS",
      "6019-2rs",
      "6019DDU",
      "NSK 6019DDU",
      "6019-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6019-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6019VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 145,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66.5,
    "static_load_kN": 54,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6019VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 95 mm bore the ring mass is significant: heat 6019 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 95 mm bore uses a smaller 145 mm OD than a 6219; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6019-RSR run faster than contact-seal 6019-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6019-2RS instead.",
      "The non-contact lip of 6019-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6019-RSR drags the lip and overheats it.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 145 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6019-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6019VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 95 mm bore 6019 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6019 at 66.5 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 6019 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×145×24 mm envelope of 6019 gives a D/d ratio of 1.53 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66.5/54 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6019VV on the 95×145×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6019 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6019 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6019-RSR bearing?",
        "a": "A 6019-RSR deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6019 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6019 uses the same ISO 15 envelope (95×145×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6019-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6019-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6019 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6019?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6019VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×145×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6019 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6019",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6019-RSR",
      "6019-rsr",
      "6019VV",
      "NSK 6019VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6019-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6019ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 145,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66.5,
    "static_load_kN": 54,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6019ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 6019-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 95 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6219 before committing to the smaller envelope.",
      "Do not wash 6019-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6019-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6019-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6019-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6019ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 95 mm bore 6019 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6019 at 66.5 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 6019 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×145×24 mm envelope of 6019 gives a D/d ratio of 1.53 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66.5/54 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6019ZZ on the 95×145×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6019 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6019; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6019-ZZ-NSK bearing?",
        "a": "A 6019-ZZ-NSK deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6019 bore code work?",
        "a": "The last two digits of 6019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6019-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6019?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6019ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×145×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6019ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6019",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6019-ZZ",
      "6019-zz",
      "6019ZZ",
      "NSK 6019ZZ",
      "6019-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6019-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6019",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 145,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66.5,
    "static_load_kN": 54,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 95 mm bore the ring mass is significant: heat 6019 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 95 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6219 before committing to the smaller envelope.",
      "The open 6019-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 95×145×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6019 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6019 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 95 mm bore 6019 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6019 at 66.5 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 6019 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×145×24 mm envelope of 6019 gives a D/d ratio of 1.53 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66.5/54 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6019 on the 95×145×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6019 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6019 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6019-NSK bearing?",
        "a": "A 6019-NSK deep-groove ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6019-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6019-NSK need?",
        "a": "The open 6019-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6019?",
        "a": "NSK lists the open 6019 under the bare designation 6019; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 95 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6019 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6019",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6019-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×145×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6019",
      "NSK 6019",
      "6019-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6020-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6020DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 54,
    "weight_g": 1290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6020-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 150 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6020DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 100 mm bore the ring mass is significant: heat 6020 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 100 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6220 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6020-2RS-NSK runs slower and cooler-limited than the open 6020; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6020-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Vibration during standstill brinells the raceways of a 100 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6020DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 100 mm bore 6020 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6020 at 66 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1290 g (1.3 kg), 6020 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×150×24 mm envelope of 6020 gives a D/d ratio of 1.50 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66/54 kN load ratings, mass 1290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6020DDU on the 100×150×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6020 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6020 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6020-2RS-NSK bearing?",
        "a": "A 6020-2RS-NSK deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6020-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6020-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6020-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6020?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6020DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×150×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6020DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6020",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6020-2RS",
      "6020-2rs",
      "6020DDU",
      "NSK 6020DDU",
      "6020-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6020-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6020VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 54,
    "weight_g": 1290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6020VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 100 mm of 6020-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 100 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6220 before committing to the smaller envelope.",
      "The low-drag lip of 6020-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6020-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.",
      "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6020-RSR and shows up later as two-point loaded raceway wear.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6020-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6020VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 100 mm bore 6020 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6020 at 66 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1290 g (1.3 kg), 6020 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×150×24 mm envelope of 6020 gives a D/d ratio of 1.50 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66/54 kN load ratings, mass 1290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6020VV on the 100×150×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6020 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6020-RSR bearing?",
        "a": "A 6020-RSR deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6020-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6000 compare with other series at the same 100 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6020?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6020VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×150×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6020VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6020",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6020-RSR",
      "6020-rsr",
      "6020VV",
      "NSK 6020VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6020-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6020ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 54,
    "weight_g": 1290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6020ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 100 mm bore the ring mass is significant: heat 6020 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 100 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6220 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6020-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6020-2RS for that.",
      "Shielded 6020-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6020-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6020ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 100 mm bore 6020 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6020 at 66 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1290 g (1.3 kg), 6020 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×150×24 mm envelope of 6020 gives a D/d ratio of 1.50 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66/54 kN load ratings, mass 1290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6020ZZ on the 100×150×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6020 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6020 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6020; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6020-ZZ-NSK bearing?",
        "a": "A 6020-ZZ-NSK deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6020-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 100 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (150×24 mm, 25.0 mm radial section) at 100 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6020?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6020ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×150×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6020ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6020",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6020-ZZ",
      "6020-zz",
      "6020ZZ",
      "NSK 6020ZZ",
      "6020-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6020-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6020",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 54,
    "weight_g": 1290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 100 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6220 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6020-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6020 units.",
      "Vibration during standstill brinells the raceways of a 100 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6020-NSK and shows up later as two-point loaded raceway wear.",
      "The open 6020 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 100 mm bore 6020 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6020 at 66 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1290 g (1.3 kg), 6020 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×150×24 mm envelope of 6020 gives a D/d ratio of 1.50 and 25.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 66/54 kN load ratings, mass 1290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6020 on the 100×150×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6020 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6020-NSK bearing?",
        "a": "A 6020-NSK deep-groove ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6020-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6020-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6020 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6020-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6020?",
        "a": "NSK lists the open 6020 under the bare designation 6020; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 100 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6020?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6020",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6020-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×150×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6020",
      "NSK 6020",
      "6020-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6021-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6021DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 160,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 79.5,
    "static_load_kN": 66,
    "weight_g": 1580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6021DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 105 mm bore the ring mass is significant: heat 6021 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6021-2RS-NSK runs slower and cooler-limited than the open 6021; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6021-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6021-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6021DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 105 mm bore 6021 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 79.5 kN dynamic load rating (C) and 66 kN static (C0), 6021 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1580 g (1.6 kg), 6021 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×160×26 mm envelope of 6021 gives a D/d ratio of 1.52 and 27.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 79.5/66 kN load ratings, mass 1580 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6021DDU on the 105×160×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6021 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6021-2RS-NSK bearing?",
        "a": "A 6021-2RS-NSK deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6021-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 105 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (160×26 mm, 27.5 mm radial section) at 105 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6021?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6021DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×160×26 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6021 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6021",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6021-2RS",
      "6021-2rs",
      "6021DDU",
      "NSK 6021DDU",
      "6021-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6021-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6021VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 160,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 79.5,
    "static_load_kN": 66,
    "weight_g": 1580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6021VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 105 mm bore the ring mass is significant: heat 6021 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.",
      "RSR low-friction seals on 6021-RSR run faster than contact-seal 6021-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6021-2RS instead.",
      "The low-drag lip of 6021-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 6021-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 26 mm-wide ring of 6021-RSR drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6021VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 105 mm bore 6021 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 79.5 kN dynamic load rating (C) and 66 kN static (C0), 6021 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1580 g (1.6 kg), 6021 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×160×26 mm envelope of 6021 gives a D/d ratio of 1.52 and 27.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 79.5/66 kN load ratings, mass 1580 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6021VV on the 105×160×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6021 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6021-RSR bearing?",
        "a": "A 6021-RSR deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6021 bore code work?",
        "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6021-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6021?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6021VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×160×26 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6021VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6021",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6021-RSR",
      "6021-rsr",
      "6021VV",
      "NSK 6021VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6021-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6021ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 160,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 79.5,
    "static_load_kN": 66,
    "weight_g": 1580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6021ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 6021-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 105 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6221 before committing to the smaller envelope.",
      "Do not wash 6021-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6021-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6021-ZZ-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6021ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 105 mm bore 6021 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 79.5 kN dynamic load rating (C) and 66 kN static (C0), 6021 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1580 g (1.6 kg), 6021 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×160×26 mm envelope of 6021 gives a D/d ratio of 1.52 and 27.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 79.5/66 kN load ratings, mass 1580 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6021ZZ on the 105×160×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6021 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6021 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6021-ZZ-NSK bearing?",
        "a": "A 6021-ZZ-NSK deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6021-ZZ-NSK need?",
        "a": "6021-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6021 bore code work?",
        "a": "The last two digits of 6021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6021?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6021ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×160×26 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6021 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6021",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6021-ZZ",
      "6021-zz",
      "6021ZZ",
      "NSK 6021ZZ",
      "6021-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6021-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6021",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 160,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 79.5,
    "static_load_kN": 66,
    "weight_g": 1580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6021 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 160 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 105 mm bore the ring mass is significant: heat 6021 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 105 mm bore uses a smaller 160 mm OD than a 6221; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Storage matters for open bearings: 6021-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6021 units.",
      "Vibration during standstill brinells the raceways of a 105 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6021-NSK.",
      "The open 6021 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 105 mm bore 6021 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 79.5 kN dynamic load rating (C) and 66 kN static (C0), 6021 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1580 g (1.6 kg), 6021 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×160×26 mm envelope of 6021 gives a D/d ratio of 1.52 and 27.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 79.5/66 kN load ratings, mass 1580 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6021 on the 105×160×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6021 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6021; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6021-NSK bearing?",
        "a": "A 6021-NSK deep-groove ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6021-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6021-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6021 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6021-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6021?",
        "a": "NSK lists the open 6021 under the bare designation 6021; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 105 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6021 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6021",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6021-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×160×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6021",
      "NSK 6021",
      "6021-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6022-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6022DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93,
    "static_load_kN": 73,
    "weight_g": 1940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6022-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6022DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6022-2RS-NSK runs slower and cooler-limited than the open 6022; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6022-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6022-2RS-NSK.",
      "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6022DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 110 mm bore 6022 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 93 kN dynamic load rating (C) and 73 kN static (C0), 6022 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1940 g (1.9 kg), 6022 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×170×28 mm envelope of 6022 gives a D/d ratio of 1.55 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93/73 kN load ratings, mass 1940 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6022DDU on the 110×170×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6022 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6022; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6022-2RS-NSK bearing?",
        "a": "A 6022-2RS-NSK deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6022-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6000 compare with other series at the same 110 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6022?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6022DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×170×28 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6022DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6022",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6022-2RS",
      "6022-2rs",
      "6022DDU",
      "NSK 6022DDU",
      "6022-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6022-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6022VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93,
    "static_load_kN": 73,
    "weight_g": 1940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6022-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6022VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 110 mm bore uses a smaller 170 mm OD than a 6222; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6022-RSR run faster than contact-seal 6022-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6022-2RS instead.",
      "The low-drag lip of 6022-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6022VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 110 mm bore 6022 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 93 kN dynamic load rating (C) and 73 kN static (C0), 6022 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1940 g (1.9 kg), 6022 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×170×28 mm envelope of 6022 gives a D/d ratio of 1.55 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93/73 kN load ratings, mass 1940 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6022VV on the 110×170×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6022 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6022 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6022; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6022-RSR bearing?",
        "a": "A 6022-RSR deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6022 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6022 uses the same ISO 15 envelope (110×170×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6022-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6022-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6022 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6022?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6022VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×170×28 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6022VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6022",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6022-RSR",
      "6022-rsr",
      "6022VV",
      "NSK 6022VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6022-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6022ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93,
    "static_load_kN": 73,
    "weight_g": 1940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6022-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 170 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6022ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 110 mm of 6022-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 110 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6222 before committing to the smaller envelope.",
      "Do not wash 6022-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6022-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6022-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6022ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 110 mm bore 6022 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 93 kN dynamic load rating (C) and 73 kN static (C0), 6022 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1940 g (1.9 kg), 6022 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×170×28 mm envelope of 6022 gives a D/d ratio of 1.55 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93/73 kN load ratings, mass 1940 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6022ZZ on the 110×170×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6022 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6022 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6022-ZZ-NSK bearing?",
        "a": "A 6022-ZZ-NSK deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6022-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 110 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (170×28 mm, 30.0 mm radial section) at 110 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6022?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6022ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×170×28 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6022ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6022",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6022-ZZ",
      "6022-zz",
      "6022ZZ",
      "NSK 6022ZZ",
      "6022-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6022-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6022",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93,
    "static_load_kN": 73,
    "weight_g": 1940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 110 mm bore the ring mass is significant: heat 6022 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 110 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6222 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6022-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6022 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6022-NSK drags the lip and overheats it.",
      "The open 6022 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 110 mm bore 6022 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 93 kN dynamic load rating (C) and 73 kN static (C0), 6022 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1940 g (1.9 kg), 6022 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×170×28 mm envelope of 6022 gives a D/d ratio of 1.55 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93/73 kN load ratings, mass 1940 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6022 on the 110×170×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6022 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6022-NSK bearing?",
        "a": "A 6022-NSK deep-groove ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6022-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6022-NSK need?",
        "a": "The open 6022-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6022?",
        "a": "NSK lists the open 6022 under the bare designation 6022; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 110 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6022?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6022",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6022-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×170×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6022",
      "NSK 6022",
      "6022-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6024-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6024DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 97,
    "static_load_kN": 80,
    "weight_g": 2080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6024DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 6024 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6024-2RS-NSK runs slower and cooler-limited than the open 6024; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6024-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6024-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6024DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 120 mm bore 6024 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 97 kN dynamic load rating (C) and 80 kN static (C0), 6024 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2080 g (2.1 kg), 6024 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 97/80 kN load ratings, mass 2080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6024DDU on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6024 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6024-2RS-NSK bearing?",
        "a": "A 6024-2RS-NSK deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6024-2RS-NSK need?",
        "a": "6024-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6024 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6024 bore code work?",
        "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6024?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6024DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×180×28 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6024DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6024-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6024-2RS",
      "6024-2rs",
      "6024DDU",
      "NSK 6024DDU",
      "6024-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6024-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6024VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 97,
    "static_load_kN": 80,
    "weight_g": 2080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6024 carries bore code 24 = 120 mm. Outside diameter 180 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6024VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 6024-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.",
      "RSR low-friction seals on 6024-RSR run faster than contact-seal 6024-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6024-2RS instead.",
      "The low-drag lip of 6024-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6024-RSR drags the lip and overheats it.",
      "Never mix components between two 6024-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues this low-friction non-contact seal as 6024VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 120 mm bore 6024 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 97 kN dynamic load rating (C) and 80 kN static (C0), 6024 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2080 g (2.1 kg), 6024 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 97/80 kN load ratings, mass 2080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6024VV on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6024; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6024-RSR bearing?",
        "a": "A 6024-RSR deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6024-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6024-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6024 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6024-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6024?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6024VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×180×28 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6024VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6024-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6024-RSR",
      "6024-rsr",
      "6024VV",
      "NSK 6024VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6024-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6024ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 97,
    "static_load_kN": 80,
    "weight_g": 2080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6024-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 180 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6024ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 6024 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 120 mm bore uses a smaller 180 mm OD than a 6224; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6024-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6024-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6024-ZZ-NSK drags the lip and overheats it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6024ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 120 mm bore 6024 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 97 kN dynamic load rating (C) and 80 kN static (C0), 6024 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2080 g (2.1 kg), 6024 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 97/80 kN load ratings, mass 2080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6024ZZ on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6024-ZZ-NSK bearing?",
        "a": "A 6024-ZZ-NSK deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6024-ZZ-NSK need?",
        "a": "6024-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6024 bore code work?",
        "a": "The last two digits of 6024 are bore code 24, giving 24 × 5 = 120 mm bore. The 180 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6024?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6024ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×180×28 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6024ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6024-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6024-ZZ",
      "6024-zz",
      "6024ZZ",
      "NSK 6024ZZ",
      "6024-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6024-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6024",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 97,
    "static_load_kN": 80,
    "weight_g": 2080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6024 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 180 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 120 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6224 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6024-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6024 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6024-NSK drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6024 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 120 mm bore 6024 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 97 kN dynamic load rating (C) and 80 kN static (C0), 6024 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2080 g (2.1 kg), 6024 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 120×180×28 mm envelope of 6024 gives a D/d ratio of 1.50 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 97/80 kN load ratings, mass 2080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6024 on the 120×180×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6024 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6024-NSK bearing?",
        "a": "A 6024-NSK deep-groove ball bearing has a 120 mm bore, 180 mm outer diameter and 28 mm width (4.724 × 7.087 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6024 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6024 uses the same ISO 15 envelope (120×180×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6024-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6024-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6024 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6024?",
        "a": "NSK lists the open 6024 under the bare designation 6024; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 120 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6024 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6024-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6024-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×180×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6024",
      "NSK 6024",
      "6024-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6026-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6026DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 117,
    "static_load_kN": 101,
    "weight_g": 3260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6026DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6026-2RS-NSK runs slower and cooler-limited than the open 6026; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6026-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 6026-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 33 mm-wide ring of 6026-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6026DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 130 mm bore places 6026 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 117 kN dynamic load rating (C) and 101 kN static (C0), 6026 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3260 g (3.3 kg), 6026 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 117/101 kN load ratings, mass 3260 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6026DDU on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6026 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6026-2RS-NSK bearing?",
        "a": "A 6026-2RS-NSK deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6026 bore code work?",
        "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6026-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6026?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6026DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×200×33 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6026 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6026-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6026-2RS",
      "6026-2rs",
      "6026DDU",
      "NSK 6026DDU",
      "6026-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6026-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6026ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 117,
    "static_load_kN": 101,
    "weight_g": 3260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6026 carries bore code 26 = 130 mm. Outside diameter 200 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6026ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6026-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6026-2RS for that.",
      "Shielded 6026-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "The housing bore for the 200 mm OD should be round within IT7; an oval bore pinches the outer ring of 6026-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6026-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6026ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 130 mm bore places 6026 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 117 kN dynamic load rating (C) and 101 kN static (C0), 6026 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3260 g (3.3 kg), 6026 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 117/101 kN load ratings, mass 3260 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6026ZZ on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6026-ZZ-NSK bearing?",
        "a": "A 6026-ZZ-NSK deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6026-ZZ-NSK need?",
        "a": "6026-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6026 bore code work?",
        "a": "The last two digits of 6026 are bore code 26, giving 26 × 5 = 130 mm bore. The 200 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6026?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6026ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×200×33 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6026ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6026-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6026-ZZ",
      "6026-zz",
      "6026ZZ",
      "NSK 6026ZZ",
      "6026-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6026-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6026",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 117,
    "static_load_kN": 101,
    "weight_g": 3260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6026 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 200 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 130 mm bore uses a smaller 200 mm OD than a 6226; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Storage matters for open bearings: 6026-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6026 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6026-NSK.",
      "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6026 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 130 mm bore places 6026 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 117 kN dynamic load rating (C) and 101 kN static (C0), 6026 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3260 g (3.3 kg), 6026 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 130×200×33 mm envelope of 6026 gives a D/d ratio of 1.54 and 35.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 117/101 kN load ratings, mass 3260 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6026 on the 130×200×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6026 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6026 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6026-NSK bearing?",
        "a": "A 6026-NSK deep-groove ball bearing has a 130 mm bore, 200 mm outer diameter and 33 mm width (5.118 × 7.874 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 130 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (200×33 mm, 35.0 mm radial section) at 130 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6026 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6026 uses the same ISO 15 envelope (130×200×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6026?",
        "a": "NSK lists the open 6026 under the bare designation 6026; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6026?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6026-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6026-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×200×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6026",
      "NSK 6026",
      "6026-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6028-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6028DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 109,
    "weight_g": 3480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6028-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6028DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6028-2RS-NSK runs slower and cooler-limited than the open 6028; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6028-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6028-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6028DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 140 mm bore places 6028 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 121 kN dynamic load rating (C) and 109 kN static (C0), 6028 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3480 g (3.5 kg), 6028 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 121/109 kN load ratings, mass 3480 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6028DDU on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6028-2RS-NSK bearing?",
        "a": "A 6028-2RS-NSK deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6028-2RS-NSK need?",
        "a": "6028-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6028 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6028 bore code work?",
        "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6028?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6028DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×210×33 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6028 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6028-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6028-2RS",
      "6028-2rs",
      "6028DDU",
      "NSK 6028DDU",
      "6028-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6028-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6028ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 109,
    "weight_g": 3480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6028-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 210 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6028ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 140 mm bore uses a smaller 210 mm OD than a 6228; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6028-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6028-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 140 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6028-ZZ-NSK.",
      "NSK catalogues the shielded version as 6028ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 140 mm bore places 6028 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 121 kN dynamic load rating (C) and 109 kN static (C0), 6028 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3480 g (3.5 kg), 6028 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 121/109 kN load ratings, mass 3480 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6028ZZ on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6028; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6028-ZZ-NSK bearing?",
        "a": "A 6028-ZZ-NSK deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6028-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 140 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (210×33 mm, 35.0 mm radial section) at 140 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6028?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6028ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×210×33 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6028ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6028-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6028-ZZ",
      "6028-zz",
      "6028ZZ",
      "NSK 6028ZZ",
      "6028-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6028-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6028",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 109,
    "weight_g": 3480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6028 carries bore code 28 = 140 mm. Outside diameter 210 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 6028 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 140 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6228 before committing to the smaller envelope.",
      "The open 6028-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 140×210×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6028-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6028-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6028 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 140 mm bore places 6028 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 121 kN dynamic load rating (C) and 109 kN static (C0), 6028 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3480 g (3.5 kg), 6028 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 140×210×33 mm envelope of 6028 gives a D/d ratio of 1.50 and 35.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 121/109 kN load ratings, mass 3480 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6028 on the 140×210×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6028 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6028-NSK bearing?",
        "a": "A 6028-NSK deep-groove ball bearing has a 140 mm bore, 210 mm outer diameter and 33 mm width (5.512 × 8.268 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6028-NSK need?",
        "a": "The open 6028-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6028 bore code work?",
        "a": "The last two digits of 6028 are bore code 28, giving 28 × 5 = 140 mm bore. The 210 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6028?",
        "a": "NSK lists the open 6028 under the bare designation 6028; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6028?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6028-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6028-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×210×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6028",
      "NSK 6028",
      "6028-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6030DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 138,
    "static_load_kN": 126,
    "weight_g": 4240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6030-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6030DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Contact seals add drag and heat: 6030-2RS-NSK runs slower and cooler-limited than the open 6030; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6030-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6030-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6030DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 150 mm bore places 6030 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 138 kN dynamic load rating (C) and 126 kN static (C0), 6030 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4240 g (4.2 kg), 6030 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 138/126 kN load ratings, mass 4240 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6030DDU on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6030 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6030; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-2RS-NSK bearing?",
        "a": "A 6030-2RS-NSK deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6030-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6030-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6030-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6030?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6030DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×225×35 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6030DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030-2RS",
      "6030-2rs",
      "6030DDU",
      "NSK 6030DDU",
      "6030-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6030VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 138,
    "static_load_kN": 126,
    "weight_g": 4240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6030-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6030VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 150 mm of 6030-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 150 mm bore uses a smaller 225 mm OD than a 6230; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The low-drag lip of 6030-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6030-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 150 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6030-RSR.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6030VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 150 mm bore places 6030 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 138 kN dynamic load rating (C) and 126 kN static (C0), 6030 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4240 g (4.2 kg), 6030 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 138/126 kN load ratings, mass 4240 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6030VV on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6030; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-RSR bearing?",
        "a": "A 6030-RSR deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6000 compare with other series at the same 150 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (225×35 mm, 37.5 mm radial section) at 150 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6030 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6030 uses the same ISO 15 envelope (150×225×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6030?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6030VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×225×35 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6030 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030-RSR",
      "6030-rsr",
      "6030VV",
      "NSK 6030VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6030ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 138,
    "static_load_kN": 126,
    "weight_g": 4240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6030-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 225 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6030ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6030-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6030-2RS for that.",
      "Do not wash 6030-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6030-ZZ-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6030ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 150 mm bore places 6030 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 138 kN dynamic load rating (C) and 126 kN static (C0), 6030 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4240 g (4.2 kg), 6030 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 138/126 kN load ratings, mass 4240 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6030ZZ on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6030; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-ZZ-NSK bearing?",
        "a": "A 6030-ZZ-NSK deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6030 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6030 uses the same ISO 15 envelope (150×225×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6030-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6030-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6030 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6030?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6030ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×225×35 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6030 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030-ZZ",
      "6030-zz",
      "6030ZZ",
      "NSK 6030ZZ",
      "6030-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6030-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6030",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 138,
    "static_load_kN": 126,
    "weight_g": 4240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6030 carries bore code 30 = 150 mm. Outside diameter 225 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 150 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6230 before committing to the smaller envelope.",
      "The open 6030-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 150×225×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6030-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6030-NSK drags the lip and overheats it.",
      "The open 6030 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 150 mm bore places 6030 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 138 kN dynamic load rating (C) and 126 kN static (C0), 6030 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4240 g (4.2 kg), 6030 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×225×35 mm envelope of 6030 gives a D/d ratio of 1.50 and 37.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 138/126 kN load ratings, mass 4240 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6030 on the 150×225×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6030 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6030-NSK bearing?",
        "a": "A 6030-NSK deep-groove ball bearing has a 150 mm bore, 225 mm outer diameter and 35 mm width (5.906 × 8.858 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6030-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6030-NSK need?",
        "a": "The open 6030-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6030?",
        "a": "NSK lists the open 6030 under the bare designation 6030; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6030?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6030-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6030-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6030",
      "NSK 6030",
      "6030-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6032-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6032DDU",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 150,
    "static_load_kN": 135,
    "weight_g": 5150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6032DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 6032 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 160 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6232 before committing to the smaller envelope.",
      "Contact seals add drag and heat: 6032-2RS-NSK runs slower and cooler-limited than the open 6032; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6032-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Vibration during standstill brinells the raceways of a 160 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6032DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 160 mm bore places 6032 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6032 at 150 kN dynamic (C) and 135 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5150 g (5.2 kg), 6032 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 150/135 kN load ratings, mass 5150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6032DDU on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6032 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6032-2RS-NSK bearing?",
        "a": "A 6032-2RS-NSK deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6000 compare with other series at the same 160 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6032 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6032?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6032DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×240×38 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6032DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6032-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6032-2RS",
      "6032-2rs",
      "6032DDU",
      "NSK 6032DDU",
      "6032-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6032-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6032ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 150,
    "static_load_kN": 135,
    "weight_g": 5150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6032ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 6032 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "ZZ shields are non-contact: 6032-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6032-2RS for that.",
      "Do not wash 6032-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6032-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6032-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6032ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 160 mm bore places 6032 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6032 at 150 kN dynamic (C) and 135 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5150 g (5.2 kg), 6032 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 150/135 kN load ratings, mass 5150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6032ZZ on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6032; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6032-ZZ-NSK bearing?",
        "a": "A 6032-ZZ-NSK deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 160 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (240×38 mm, 40.0 mm radial section) at 160 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6032 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6032 uses the same ISO 15 envelope (160×240×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6032?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6032ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×240×38 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6032ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6032-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6032-ZZ",
      "6032-zz",
      "6032ZZ",
      "NSK 6032ZZ",
      "6032-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6032-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6032",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 150,
    "static_load_kN": 135,
    "weight_g": 5150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6032 carries bore code 32 = 160 mm. Outside diameter 240 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 160 mm bore uses a smaller 240 mm OD than a 6232; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6032-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 160×240×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6032 units.",
      "Vibration during standstill brinells the raceways of a 160 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 6032-NSK drags the lip and overheats it.",
      "The open 6032 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 160 mm bore places 6032 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6032 at 150 kN dynamic (C) and 135 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5150 g (5.2 kg), 6032 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×240×38 mm envelope of 6032 gives a D/d ratio of 1.50 and 40.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 150/135 kN load ratings, mass 5150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6032 on the 160×240×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6032 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6032; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6032-NSK bearing?",
        "a": "A 6032-NSK deep-groove ball bearing has a 160 mm bore, 240 mm outer diameter and 38 mm width (6.299 × 9.449 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6032 bore code work?",
        "a": "The last two digits of 6032 are bore code 32, giving 32 × 5 = 160 mm bore. The 240 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6032 mean?",
        "a": "A bare 6032 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 6032?",
        "a": "NSK lists the open 6032 under the bare designation 6032; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6032 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6032-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6032-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×240×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6032",
      "NSK 6032",
      "6032-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6034-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6034VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 177,
    "static_load_kN": 161,
    "weight_g": 6890,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6034VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 6034-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6034-RSR run faster than contact-seal 6034-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6034-2RS instead.",
      "The non-contact lip of 6034-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 170 mm bore position before relying on it as sealed-for-life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 42 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6034VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 170 mm bore places 6034 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6034 at 177 kN dynamic (C) and 161 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 6890 g (6.9 kg), 6034 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 177/161 kN load ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034VV on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6034 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6034-RSR bearing?",
        "a": "A 6034-RSR deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6034-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6000 compare with other series at the same 170 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6034?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6034VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×260×42 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6034VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6034-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-2RS",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6034-RSR",
      "6034-rsr",
      "6034VV",
      "NSK 6034VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6034-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6034ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 177,
    "static_load_kN": 161,
    "weight_g": 6890,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6034ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 6034-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 170 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6234 before committing to the smaller envelope.",
      "Do not wash 6034-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6034-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 42 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6034ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 170 mm bore places 6034 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6034 at 177 kN dynamic (C) and 161 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 6890 g (6.9 kg), 6034 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 177/161 kN load ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034ZZ on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6034; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6034-ZZ bearing?",
        "a": "A 6034-ZZ deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6034 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6034 uses the same ISO 15 envelope (170×260×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6034-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 6034-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6034 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6034?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6034ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×260×42 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6034ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6034-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-2RS",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6034-ZZ",
      "6034-zz",
      "6034ZZ",
      "NSK 6034ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6034-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6034",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 177,
    "static_load_kN": 161,
    "weight_g": 6890,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6034 carries bore code 34 = 170 mm. Outside diameter 260 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass is significant: heat 6034 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 170 mm bore uses a smaller 260 mm OD than a 6234; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6034-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 170×260×42 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6034 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6034-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6034 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 170 mm bore places 6034 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6034 at 177 kN dynamic (C) and 161 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 6890 g (6.9 kg), 6034 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×260×42 mm envelope of 6034 gives a D/d ratio of 1.53 and 45.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 177/161 kN load ratings, mass 6890 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6034 on the 170×260×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6034 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6034-NSK bearing?",
        "a": "A 6034-NSK deep-groove ball bearing has a 170 mm bore, 260 mm outer diameter and 42 mm width (6.693 × 10.236 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 170 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (260×42 mm, 45.0 mm radial section) at 170 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6034 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6034 uses the same ISO 15 envelope (170×260×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6034?",
        "a": "NSK lists the open 6034 under the bare designation 6034; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6034 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6034-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-2RS",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6034-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×260×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6034",
      "NSK 6034",
      "6034-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6036-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6036VV",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 198,
    "static_load_kN": 185,
    "weight_g": 8880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6036 carries bore code 36 = 180 mm. Outside diameter 280 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6036VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "RSR low-friction seals on 6036-RSR run faster than contact-seal 6036-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6036-2RS instead.",
      "The non-contact lip of 6036-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 180 mm bore position before relying on it as sealed-for-life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6036-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6036VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 180 mm bore places 6036 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6036 at 198 kN dynamic (C) and 185 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8880 g (8.9 kg), 6036 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 180×280×46 mm envelope of 6036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 198/185 kN load ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036VV on the 180×280×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6036 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6036-RSR bearing?",
        "a": "A 6036-RSR deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6036 bore code work?",
        "a": "The last two digits of 6036 are bore code 36, giving 36 × 5 = 180 mm bore. The 280 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6036-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6036?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6036VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 180×280×46 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6036VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6036-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6036",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6036-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6036-RSR",
      "6036-rsr",
      "6036VV",
      "NSK 6036VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6036-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6036ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 198,
    "static_load_kN": 185,
    "weight_g": 8880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6036-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 280 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6036ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass is significant: heat 6036 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 60xx extra-light section at 180 mm bore uses a smaller 280 mm OD than a 6236; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "Do not wash 6036-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6036-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6036-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6036ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 180 mm bore places 6036 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6036 at 198 kN dynamic (C) and 185 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8880 g (8.9 kg), 6036 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 180×280×46 mm envelope of 6036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 198/185 kN load ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036ZZ on the 180×280×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6036 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6036; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6036-ZZ bearing?",
        "a": "A 6036-ZZ deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6036-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6036-ZZ need?",
        "a": "6036-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6036?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6036ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 180×280×46 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6036ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6036-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6036",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6036-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6036-ZZ",
      "6036-zz",
      "6036ZZ",
      "NSK 6036ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6036-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6036",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 198,
    "static_load_kN": 185,
    "weight_g": 8880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6036 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 280 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Choosing the 60xx extra-light section saves radial space at 180 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6236 before committing to the smaller envelope.",
      "The open 6036-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 180×280×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6036 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6036-NSK-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6036 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 180 mm bore places 6036 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6036 at 198 kN dynamic (C) and 185 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8880 g (8.9 kg), 6036 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 180×280×46 mm envelope of 6036 gives a D/d ratio of 1.56 and 50.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 198/185 kN load ratings, mass 8880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6036 on the 180×280×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6036 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6036 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6036-NSK bearing?",
        "a": "A 6036-NSK deep-groove ball bearing has a 180 mm bore, 280 mm outer diameter and 46 mm width (7.087 × 11.024 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6036-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6036-NSK need?",
        "a": "The open 6036-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6036?",
        "a": "NSK lists the open 6036 under the bare designation 6036; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6036?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6036-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6036",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6036-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×280×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6036",
      "NSK 6036",
      "6036-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6038-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6038ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 207,
    "static_load_kN": 201,
    "weight_g": 9390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6038 carries bore code 38 = 190 mm. Outside diameter 290 mm and width 46 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6038ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 190 mm of 6038-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 190 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6238 before committing to the smaller envelope.",
      "Do not wash 6038-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6038-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 290 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6038-ZZ.",
      "The housing bore for the 290 mm OD should be round within IT7; an oval bore pinches the outer ring of 6038-ZZ and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6038ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 190 mm bore places 6038 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6038 at 207 kN dynamic (C) and 201 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 9390 g (9.4 kg), 6038 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 190×290×46 mm envelope of 6038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 207/201 kN load ratings, mass 9390 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6038ZZ on the 190×290×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6038 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6038; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6038 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6038-ZZ bearing?",
        "a": "A 6038-ZZ deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6038-ZZ need?",
        "a": "6038-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6038 bore code work?",
        "a": "The last two digits of 6038 are bore code 38, giving 38 × 5 = 190 mm bore. The 290 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6038?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6038ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 190×290×46 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6038ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6038-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6038",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6038-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6038-ZZ",
      "6038-zz",
      "6038ZZ",
      "NSK 6038ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6038-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6038",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 207,
    "static_load_kN": 201,
    "weight_g": 9390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6038 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 290 mm outside diameter and 46 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 190 mm of 6038-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 60xx extra-light section at 190 mm bore uses a smaller 290 mm OD than a 6238; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.",
      "The open 6038-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 190×290×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6038 units.",
      "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 290 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6038-NSK.",
      "The open 6038 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 190 mm bore places 6038 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6038 at 207 kN dynamic (C) and 201 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 9390 g (9.4 kg), 6038 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 190×290×46 mm envelope of 6038 gives a D/d ratio of 1.53 and 50.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 207/201 kN load ratings, mass 9390 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6038 on the 190×290×46 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6038 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6038 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6038-NSK bearing?",
        "a": "A 6038-NSK deep-groove ball bearing has a 190 mm bore, 290 mm outer diameter and 46 mm width (7.48 × 11.417 × 1.811 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6000 compare with other series at the same 190 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (290×46 mm, 50.0 mm radial section) at 190 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "Are 6038 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6038 uses the same ISO 15 envelope (190×290×46 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6038?",
        "a": "NSK lists the open 6038 under the bare designation 6038; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6038 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6038-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6038",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6038-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×290×46 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6038",
      "NSK 6038",
      "6038-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6040-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6040ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 228,
    "static_load_kN": 226,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6040-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 310 mm outside diameter and 51 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6040ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass is significant: heat 6040 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 200 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6240 before committing to the smaller envelope.",
      "ZZ shields are non-contact: 6040-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6040-2RS for that.",
      "Shielded 6040-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6040-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6040-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6040ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 200 mm bore places 6040 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6040 at 228 kN dynamic (C) and 226 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12000 g (12.0 kg), 6040 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 200×310×51 mm envelope of 6040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 228/226 kN load ratings, mass 12000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6040ZZ on the 200×310×51 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6040 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6040; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6040-ZZ bearing?",
        "a": "A 6040-ZZ deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6040-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6000 compare with other series at the same 200 mm bore?",
        "a": "The second digit is the diameter series: 60 is the smallest standard section (310×51 mm, 55.0 mm radial section) at 200 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces."
      },
      {
        "q": "What is the NSK suffix for a sealed 6040?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6040ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 200×310×51 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6040ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6040-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6040-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6040-ZZ",
      "6040-zz",
      "6040ZZ",
      "NSK 6040ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6040",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6040",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 228,
    "static_load_kN": 226,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6040 carries bore code 40 = 200 mm. Outside diameter 310 mm and width 51 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 200 mm bore the ring mass is significant: heat 6040 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 200 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6240 before committing to the smaller envelope.",
      "Storage matters for open bearings: 6040 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6040 units.",
      "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6040 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 200 mm bore places 6040 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6040 at 228 kN dynamic (C) and 226 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12000 g (12.0 kg), 6040 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 200×310×51 mm envelope of 6040 gives a D/d ratio of 1.55 and 55.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 228/226 kN load ratings, mass 12000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6040 on the 200×310×51 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6040 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6040; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6040 bearing?",
        "a": "A 6040 deep-groove ball bearing has a 200 mm bore, 310 mm outer diameter and 51 mm width (7.874 × 12.205 × 2.008 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6040 have?",
        "a": "Unless a clearance suffix says otherwise, 6040 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6040 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6040 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6040?",
        "a": "NSK lists the open 6040 under the bare designation 6040; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6040?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6040-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6040-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×310×51 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6040",
      "NSK 6040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6044-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6044ZZ",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 259,
    "static_load_kN": 271,
    "weight_g": 18600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6044ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 220 mm of 6044-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 220 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6244 before committing to the smaller envelope.",
      "Do not wash 6044-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6044-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6044-C3. No clearance suffix means normal CN clearance.",
      "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6044ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 220 mm bore places 6044 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6044 at 259 kN dynamic (C) and 271 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 18600 g (18.6 kg), 6044 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 220×340×56 mm envelope of 6044 gives a D/d ratio of 1.55 and 60.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 259/271 kN load ratings, mass 18600 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6044ZZ on the 220×340×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6044 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6044; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6044-ZZ bearing?",
        "a": "A 6044-ZZ deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6044-ZZ need?",
        "a": "6044-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6044 bore code work?",
        "a": "The last two digits of 6044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6044?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6044ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 220×340×56 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6044ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6044-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6044",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6044-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6044-ZZ",
      "6044-zz",
      "6044ZZ",
      "NSK 6044ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6044-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6044",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 259,
    "static_load_kN": 271,
    "weight_g": 18600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6044 carries bore code 44 = 220 mm. Outside diameter 340 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 220 mm of 6044-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Choosing the 60xx extra-light section saves radial space at 220 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6244 before committing to the smaller envelope.",
      "The open 6044-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 220×340×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6044-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6044 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 220 mm bore places 6044 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6044 at 259 kN dynamic (C) and 271 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 18600 g (18.6 kg), 6044 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 220×340×56 mm envelope of 6044 gives a D/d ratio of 1.55 and 60.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 259/271 kN load ratings, mass 18600 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6044 on the 220×340×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6044 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6044-NSK bearing?",
        "a": "A 6044-NSK deep-groove ball bearing has a 220 mm bore, 340 mm outer diameter and 56 mm width (8.661 × 13.386 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6044-NSK need?",
        "a": "The open 6044-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6044 bore code work?",
        "a": "The last two digits of 6044 are bore code 44, giving 44 × 5 = 220 mm bore. The 340 mm outside diameter and 56 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6044?",
        "a": "NSK lists the open 6044 under the bare designation 6044; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6044 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6044-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6044",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6044-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×340×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6044",
      "NSK 6044",
      "6044-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6048-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6048",
    "series": "6000-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 269,
    "static_load_kN": 296,
    "weight_g": 19900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6048 carries bore code 48 = 240 mm. Outside diameter 360 mm and width 56 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass is significant: heat 6048 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Choosing the 60xx extra-light section saves radial space at 240 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6248 before committing to the smaller envelope.",
      "The open 6048-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 240×360×56 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6048 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6048 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 240 mm bore places 6048 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6048 at 269 kN dynamic (C) and 296 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 19900 g (19.9 kg), 6048 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 240×360×56 mm envelope of 6048 gives a D/d ratio of 1.50 and 60.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 269/296 kN load ratings, mass 19900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6048 on the 240×360×56 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6048 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6048-NSK bearing?",
        "a": "A 6048-NSK deep-groove ball bearing has a 240 mm bore, 360 mm outer diameter and 56 mm width (9.449 × 14.173 × 2.205 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6048-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6048-NSK need?",
        "a": "The open 6048-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6048?",
        "a": "NSK lists the open 6048 under the bare designation 6048; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6048 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6048-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6048",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6048-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×360×56 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6048",
      "NSK 6048",
      "6048-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61800-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6800DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 19,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1.89,
    "static_load_kN": 0.84,
    "weight_g": 5,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 10 = 10 mm. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6800DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61800 with C3 clearance and re-check the residual value after mounting.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.",
      "Contact seals add drag and heat: 61800-2RS-NSK runs slower and cooler-limited than the open 61800; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61800-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 19 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61800-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6800DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 10 mm bore the 61800 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 1.89 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 5 g, 61800 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 1.89/0.84 kN load ratings, mass 5 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6800DD on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61800-2RS-NSK bearing?",
        "a": "A 61800-2RS-NSK deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61800-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61800 compare with other series at the same 10 mm bore?",
        "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61800?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6800DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×19×5 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6800DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61800-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61800-2RS",
      "61800-2rs",
      "6800DD",
      "NSK 6800DD",
      "61800-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61800-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6800VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 19,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1.89,
    "static_load_kN": 0.84,
    "weight_g": 5,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61800-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 19 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6800VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61800 with C3 clearance and re-check the residual value after mounting.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.",
      "The low-drag lip of 61800-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61800-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61800-RSR.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 19 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61800-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6800VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 10 mm bore the 61800 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 1.89 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 5 g, 61800 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 1.89/0.84 kN load ratings, mass 5 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6800VV on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61800-RSR bearing?",
        "a": "A 61800-RSR deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61800-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61800-RSR need?",
        "a": "61800-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61800 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61800?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6800VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×19×5 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61800 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61800-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61800-RSR",
      "61800-rsr",
      "6800VV",
      "NSK 6800VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61800-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6800ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 19,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1.89,
    "static_load_kN": 0.84,
    "weight_g": 5,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 10 = 10 mm. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6800ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61800 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.",
      "ZZ shields are non-contact: 61800-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61800-2RS for that.",
      "Shielded 61800-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6800ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 10 mm bore the 61800 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 1.89 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 5 g, 61800 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 1.89/0.84 kN load ratings, mass 5 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6800ZZ on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61800; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61800-ZZ-NSK bearing?",
        "a": "A 61800-ZZ-NSK deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61800-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61800-ZZ-NSK need?",
        "a": "61800-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61800?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6800ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×19×5 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61800 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61800-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61800-ZZ",
      "61800-zz",
      "6800ZZ",
      "NSK 6800ZZ",
      "61800-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61800-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6800",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 19,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1.89,
    "static_load_kN": 0.84,
    "weight_g": 5,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 10 = 10 mm. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61800 with C3 for those conditions.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.",
      "The open 61800-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 10×19×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61800-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61800-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 19 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61800-NSK.",
      "The open 61800 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 10 mm bore the 61800 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 1.89 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 5 g, 61800 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 1.89/0.84 kN load ratings, mass 5 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6800 on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61800; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61800-NSK bearing?",
        "a": "A 61800-NSK deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61800-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61800-NSK need?",
        "a": "The open 61800-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61800?",
        "a": "NSK lists the open 61800 under the bare designation 6800; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 10 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61800 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61800-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61800",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61800",
      "6800",
      "NSK 6800",
      "61800-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61801-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6801DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 21,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.11,
    "static_load_kN": 1.04,
    "weight_g": 6,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61801 carries bore code 12 = 12 mm. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6801DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61801 with C3 clearance and re-check the residual value after mounting.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.",
      "Contact seals add drag and heat: 61801-2RS-NSK runs slower and cooler-limited than the open 61801; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61801-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6801DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 12 mm bore the 61801 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.11 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 6 g, 61801 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 2.11/1.04 kN load ratings, mass 6 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6801DD on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61801 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61801-2RS-NSK bearing?",
        "a": "A 61801-2RS-NSK deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61801 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61801 uses the same ISO 15 envelope (12×21×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61801-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61801-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61801 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61801?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6801DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×21×5 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6801DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61801-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61801-2RS",
      "61801-2rs",
      "6801DD",
      "NSK 6801DD",
      "61801-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61801-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6801VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 21,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.11,
    "static_load_kN": 1.04,
    "weight_g": 6,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61801 carries bore code 12 = 12 mm. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6801VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61801 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.",
      "The low-drag lip of 61801-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61801-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61801-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6801VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 12 mm bore the 61801 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.11 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 6 g, 61801 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 2.11/1.04 kN load ratings, mass 6 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6801VV on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61801; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61801-RSR bearing?",
        "a": "A 61801-RSR deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61801-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61800 compare with other series at the same 12 mm bore?",
        "a": "618 is an extra-thin section: 21×5 mm, only 4.5 mm radial section at 12 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61801?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6801VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×21×5 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6801VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61801-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61801-RSR",
      "61801-rsr",
      "6801VV",
      "NSK 6801VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61801-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6801ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 21,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.11,
    "static_load_kN": 1.04,
    "weight_g": 6,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61801 carries bore code 12 = 12 mm. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6801ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61801 with C3 for those conditions.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.",
      "Do not wash 61801-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61801-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61801-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6801ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 12 mm bore the 61801 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.11 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 6 g, 61801 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 2.11/1.04 kN load ratings, mass 6 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6801ZZ on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61801; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61801-ZZ-NSK bearing?",
        "a": "A 61801-ZZ-NSK deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61801-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61801-ZZ-NSK need?",
        "a": "61801-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61801?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6801ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×21×5 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6801ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61801-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61801-ZZ",
      "61801-zz",
      "6801ZZ",
      "NSK 6801ZZ",
      "61801-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61801-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6801",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 21,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.11,
    "static_load_kN": 1.04,
    "weight_g": 6,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61801 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61801 with C3 for those conditions.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.",
      "Storage matters for open bearings: 61801-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61801 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 21 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61801-NSK.",
      "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61801 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 12 mm bore the 61801 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.11 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 6 g, 61801 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 2.11/1.04 kN load ratings, mass 6 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6801 on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61801 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61801-NSK bearing?",
        "a": "A 61801-NSK deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61801-NSK need?",
        "a": "The open 61801-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61801 bore code work?",
        "a": "The last two digits of 61801 are bore code 12, giving 12 × 5 = 12 mm bore. The 21 mm outside diameter and 5 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61801?",
        "a": "NSK lists the open 61801 under the bare designation 6801; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 12 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6801?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61801-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61801-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61801",
      "6801",
      "NSK 6801",
      "61801-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61802-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6802DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 24,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.28,
    "static_load_kN": 1.26,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61802-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 24 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6802DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61802 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.",
      "Heat is the enemy of the sealed 61802-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61802-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61802-2RS-NSK drags the lip and overheats it.",
      "The housing bore for the 24 mm OD should be round within IT7; an oval bore pinches the outer ring of 61802-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6802DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 15 mm bore the 61802 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.28 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61802 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.28/1.26 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6802DD on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61802; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61802 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61802-2RS-NSK bearing?",
        "a": "A 61802-2RS-NSK deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61802-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61802-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61802 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61802-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61802?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6802DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×24×5 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6802DD keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61802-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61802-2RS",
      "61802-2rs",
      "6802DD",
      "NSK 6802DD",
      "61802-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61802-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6802VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 24,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.28,
    "static_load_kN": 1.26,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 15 = 15 mm. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6802VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61802 with C3 for those conditions.",
      "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.",
      "RSR low-friction seals on 61802-RSR run faster than contact-seal 61802-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61802-2RS instead.",
      "The low-drag lip of 61802-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 24 mm OD should be round within IT7; an oval bore pinches the outer ring of 61802-RSR and shows up later as two-point loaded raceway wear.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61802-RSR drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6802VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 15 mm bore the 61802 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.28 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61802 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.28/1.26 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6802VV on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61802; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61802 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61802-RSR bearing?",
        "a": "A 61802-RSR deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61802-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61800 compare with other series at the same 15 mm bore?",
        "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61802?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6802VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×24×5 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6802VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61802-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61802-RSR",
      "61802-rsr",
      "6802VV",
      "NSK 6802VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61802-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6802ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 24,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.28,
    "static_load_kN": 1.26,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61802-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 24 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6802ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61802 with C3 for those conditions.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 15 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.",
      "ZZ shields are non-contact: 61802-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61802-2RS for that.",
      "Shielded 61802-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6802ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 15 mm bore the 61802 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.28 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61802 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.28/1.26 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6802ZZ on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61802; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61802 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61802-ZZ-NSK bearing?",
        "a": "A 61802-ZZ-NSK deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61802-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61802-ZZ-NSK need?",
        "a": "61802-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61802?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6802ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×24×5 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6802ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61802-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61802-ZZ",
      "61802-zz",
      "6802ZZ",
      "NSK 6802ZZ",
      "61802-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61802-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6802",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 24,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.28,
    "static_load_kN": 1.26,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 15 = 15 mm. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61802 with C3 clearance and re-check the residual value after mounting.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 15 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.",
      "Storage matters for open bearings: 61802-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61802 units.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61802 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 15 mm bore the 61802 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.28 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61802 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.28/1.26 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6802 on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61802; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61802-NSK bearing?",
        "a": "A 61802-NSK deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 15 mm bore?",
        "a": "618 is an extra-thin section: 24×5 mm, only 4.5 mm radial section at 15 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61802 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61802 uses the same ISO 15 envelope (15×24×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61802?",
        "a": "NSK lists the open 61802 under the bare designation 6802; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 15 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6802?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61802-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61802-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61802",
      "6802",
      "NSK 6802",
      "61802-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61803-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6803DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 26,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.89,
    "static_load_kN": 1.57,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61803-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6803DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 17 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.",
      "Contact seals add drag and heat: 61803-2RS-NSK runs slower and cooler-limited than the open 61803; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61803-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6803DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 17 mm bore the 61803 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.89 kN dynamic load rating (C) and 1.57 kN static (C0), 61803 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61803 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.89/1.57 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6803DD on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61803; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61803-2RS-NSK bearing?",
        "a": "A 61803-2RS-NSK deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61803-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61803-2RS-NSK need?",
        "a": "61803-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61803 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61803?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6803DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×26×5 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61803 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61803-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61803-2RS",
      "61803-2rs",
      "6803DD",
      "NSK 6803DD",
      "61803-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61803-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6803VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 26,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.89,
    "static_load_kN": 1.57,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61803-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6803VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 17 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.",
      "RSR low-friction seals on 61803-RSR-NSK run faster than contact-seal 61803-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61803-2RS instead.",
      "The non-contact lip of 61803-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61803-RSR-NSK drags the lip and overheats it.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6803VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 17 mm bore the 61803 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.89 kN dynamic load rating (C) and 1.57 kN static (C0), 61803 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61803 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.89/1.57 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6803VV on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61803 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61803-RSR-NSK bearing?",
        "a": "A 61803-RSR-NSK deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61803-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61803-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61803-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61803?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6803VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×26×5 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61803 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61803-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61803-RSR",
      "61803-rsr",
      "6803VV",
      "NSK 6803VV",
      "61803-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61803-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6803ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 26,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.89,
    "static_load_kN": 1.57,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61803-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6803ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 17 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.",
      "ZZ shields are non-contact: 61803-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61803-2RS for that.",
      "Shielded 61803-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61803-ZZ-NSK.",
      "Never mix components between two 61803-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6803ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 17 mm bore the 61803 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.89 kN dynamic load rating (C) and 1.57 kN static (C0), 61803 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61803 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.89/1.57 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6803ZZ on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61803 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61803; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61803-ZZ-NSK bearing?",
        "a": "A 61803-ZZ-NSK deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61803 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61803 uses the same ISO 15 envelope (17×26×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61803-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61803-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61803?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6803ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×26×5 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6803ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61803-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61803-ZZ",
      "61803-zz",
      "6803ZZ",
      "NSK 6803ZZ",
      "61803-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61803-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6803",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 26,
    "B_mm": 5,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.89,
    "static_load_kN": 1.57,
    "weight_g": 7,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61803 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 61803-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 17 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.",
      "The open 61803-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 17×26×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61803 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61803-NSK drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61803-NSK.",
      "The open 61803 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 17 mm bore the 61803 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.89 kN dynamic load rating (C) and 1.57 kN static (C0), 61803 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 7 g, 61803 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 2.89/1.57 kN load ratings, mass 7 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6803 on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61803 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61803-NSK bearing?",
        "a": "A 61803-NSK deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61803-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61803-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61803-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 61803?",
        "a": "NSK lists the open 61803 under the bare designation 6803; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 17 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6803?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61803-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61803-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61803",
      "6803",
      "NSK 6803",
      "61803-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6804DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.4,
    "static_load_kN": 2.47,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61804-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 32 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6804DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 20 mm shaft for 61804 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.",
      "Heat is the enemy of the sealed 61804-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61804-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61804-2RS-NSK.",
      "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 61804-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6804DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 20 mm bore puts 61804 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.4 kN dynamic load rating (C) and 2.47 kN static (C0), 61804 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 17 g, 61804 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.4/2.47 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6804DD on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61804; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61804 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-2RS-NSK bearing?",
        "a": "A 61804-2RS-NSK deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61804-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61804-2RS-NSK need?",
        "a": "61804-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61804 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61804?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6804DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×32×7 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6804DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804-2RS",
      "61804-2rs",
      "6804DD",
      "NSK 6804DD",
      "61804-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6804VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.4,
    "static_load_kN": 2.47,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61804-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 32 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6804VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61804-RSR-NSK.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.",
      "RSR low-friction seals on 61804-RSR-NSK run faster than contact-seal 61804-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61804-2RS instead.",
      "The low-drag lip of 61804-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 61804-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6804VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 20 mm bore puts 61804 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.4 kN dynamic load rating (C) and 2.47 kN static (C0), 61804 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 17 g, 61804 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.4/2.47 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6804VV on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-RSR-NSK bearing?",
        "a": "A 61804-RSR-NSK deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61804-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61804-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61804 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61804-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61804?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6804VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×32×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6804VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804-RSR",
      "61804-rsr",
      "6804VV",
      "NSK 6804VV",
      "61804-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6804ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.4,
    "static_load_kN": 2.47,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61804-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 32 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6804ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61804-ZZ.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 20 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6204.",
      "ZZ shields are non-contact: 61804-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61804-2RS for that.",
      "Shielded 61804-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61804-ZZ drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61804-ZZ.",
      "NSK catalogues the shielded version as 6804ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 20 mm bore puts 61804 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.4 kN dynamic load rating (C) and 2.47 kN static (C0), 61804 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 17 g, 61804 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.4/2.47 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6804ZZ on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-ZZ bearing?",
        "a": "A 61804-ZZ deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61804-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61804-ZZ need?",
        "a": "61804-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61804?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6804ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×32×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6804ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804-ZZ",
      "61804-zz",
      "6804ZZ",
      "NSK 6804ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61804-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6804",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 32,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.4,
    "static_load_kN": 2.47,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61804-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 618xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6204.",
      "The open 61804-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 20×32×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61804-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 61804-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61804 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 20 mm bore puts 61804 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.4 kN dynamic load rating (C) and 2.47 kN static (C0), 61804 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 17 g, 61804 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×32×7 mm envelope of 61804 gives a D/d ratio of 1.60 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.4/2.47 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6804 on the 20×32×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61804 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61804-NSK bearing?",
        "a": "A 61804-NSK deep-groove ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61804-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61804-NSK need?",
        "a": "The open 61804-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61804?",
        "a": "NSK lists the open 61804 under the bare designation 6804; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61804 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61804-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61804-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61804-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×32×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61804",
      "6804",
      "NSK 6804",
      "61804-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6805DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.95,
    "static_load_kN": 3.15,
    "weight_g": 21,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61805-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6805DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61805-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.",
      "Heat is the enemy of the sealed 61805-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61805-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61805-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6805DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 25 mm bore puts 61805 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.95 kN dynamic load rating (C) and 3.15 kN static (C0), 61805 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 21 g, 61805 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.95/3.15 kN load ratings, mass 21 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6805DD on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61805 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-2RS-NSK bearing?",
        "a": "A 61805-2RS-NSK deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61805-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61805-2RS-NSK need?",
        "a": "61805-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61805 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61805?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6805DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×37×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6805DD keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805-2RS",
      "61805-2rs",
      "6805DD",
      "NSK 6805DD",
      "61805-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6805VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.95,
    "static_load_kN": 3.15,
    "weight_g": 21,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6805VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 25 mm shaft for 61805 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.",
      "RSR low-friction seals on 61805-RSR-NSK run faster than contact-seal 61805-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61805-2RS instead.",
      "The low-drag lip of 61805-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 37 mm OD should be round within IT7; an oval bore pinches the outer ring of 61805-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6805VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 25 mm bore puts 61805 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.95 kN dynamic load rating (C) and 3.15 kN static (C0), 61805 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 21 g, 61805 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.95/3.15 kN load ratings, mass 21 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6805VV on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-RSR-NSK bearing?",
        "a": "A 61805-RSR-NSK deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61805-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61805-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61805 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61805-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61805?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6805VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×37×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6805VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805-RSR",
      "61805-rsr",
      "6805VV",
      "NSK 6805VV",
      "61805-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6805ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.95,
    "static_load_kN": 3.15,
    "weight_g": 21,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6805ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 25 mm shaft for 61805 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.",
      "ZZ shields are non-contact: 61805-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61805-2RS for that.",
      "Shielded 61805-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61805-ZZ drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6805ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 25 mm bore puts 61805 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.95 kN dynamic load rating (C) and 3.15 kN static (C0), 61805 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 21 g, 61805 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.95/3.15 kN load ratings, mass 21 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6805ZZ on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61805 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61805; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-ZZ bearing?",
        "a": "A 61805-ZZ deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61805-ZZ need?",
        "a": "61805-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61805 bore code work?",
        "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61805?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6805ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×37×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6805ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805-ZZ",
      "61805-zz",
      "6805ZZ",
      "NSK 6805ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61805-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6805",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 37,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.95,
    "static_load_kN": 3.15,
    "weight_g": 21,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61805 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 37 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 25 mm shaft for 61805 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 25 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6205.",
      "Storage matters for open bearings: 61805-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61805 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 61805 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 25 mm bore puts 61805 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 4.95 kN dynamic load rating (C) and 3.15 kN static (C0), 61805 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 21 g, 61805 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×37×7 mm envelope of 61805 gives a D/d ratio of 1.48 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 4.95/3.15 kN load ratings, mass 21 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6805 on the 25×37×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61805 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61805; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61805-NSK bearing?",
        "a": "A 61805-NSK deep-groove ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61805-NSK need?",
        "a": "The open 61805-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61805 bore code work?",
        "a": "The last two digits of 61805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61805?",
        "a": "NSK lists the open 61805 under the bare designation 6805; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6805?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61805-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61805-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61805-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×37×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61805",
      "6805",
      "NSK 6805",
      "61805-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6806DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.2,
    "static_load_kN": 3.65,
    "weight_g": 24,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61806-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6806DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 30 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6206.",
      "Heat is the enemy of the sealed 61806-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61806-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61806-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6806DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 30 mm bore puts 61806 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61806 at 5.2 kN dynamic (C) and 3.65 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 24 g, 61806 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 5.2/3.65 kN load ratings, mass 24 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6806DD on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-2RS-NSK bearing?",
        "a": "A 61806-2RS-NSK deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61806-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61806-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61806 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61806-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61806?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6806DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×42×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61806 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806-2RS",
      "61806-2rs",
      "6806DD",
      "NSK 6806DD",
      "61806-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6806VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.2,
    "static_load_kN": 3.65,
    "weight_g": 24,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6806VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61806-RSR-NSK.",
      "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.",
      "RSR low-friction seals on 61806-RSR-NSK run faster than contact-seal 61806-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61806-2RS instead.",
      "The non-contact lip of 61806-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.",
      "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6806VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 30 mm bore puts 61806 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61806 at 5.2 kN dynamic (C) and 3.65 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 24 g, 61806 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 5.2/3.65 kN load ratings, mass 24 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6806VV on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61806; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-RSR-NSK bearing?",
        "a": "A 61806-RSR-NSK deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61806-RSR-NSK need?",
        "a": "61806-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61806 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61806 bore code work?",
        "a": "The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61806?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6806VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×42×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61806 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806-RSR",
      "61806-rsr",
      "6806VV",
      "NSK 6806VV",
      "61806-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6806ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.2,
    "static_load_kN": 3.65,
    "weight_g": 24,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61806-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6806ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 618xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6206.",
      "Do not wash 61806-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61806-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61806-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 61806-ZZ and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6806ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 30 mm bore puts 61806 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61806 at 5.2 kN dynamic (C) and 3.65 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 24 g, 61806 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 5.2/3.65 kN load ratings, mass 24 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6806ZZ on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61806 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-ZZ bearing?",
        "a": "A 61806-ZZ deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 30 mm bore?",
        "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61806 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61806 uses the same ISO 15 envelope (30×42×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61806?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6806ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×42×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6806ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806-ZZ",
      "61806-zz",
      "6806ZZ",
      "NSK 6806ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61806-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6806",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 42,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.2,
    "static_load_kN": 3.65,
    "weight_g": 24,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61806 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61806-NSK.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 30 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6206.",
      "Storage matters for open bearings: 61806-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61806 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61806 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 30 mm bore puts 61806 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61806 at 5.2 kN dynamic (C) and 3.65 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 24 g, 61806 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 30×42×7 mm envelope of 61806 gives a D/d ratio of 1.40 and 6.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 5.2/3.65 kN load ratings, mass 24 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6806 on the 30×42×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61806 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61806; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61806-NSK bearing?",
        "a": "A 61806-NSK deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 30 mm bore?",
        "a": "618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61806 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61806 uses the same ISO 15 envelope (30×42×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61806?",
        "a": "NSK lists the open 61806 under the bare designation 6806; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61806 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61806-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61806-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61806-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×42×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61806",
      "6806",
      "NSK 6806",
      "61806-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6807DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.4,
    "static_load_kN": 4.1,
    "weight_g": 27,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61807-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6807DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.",
      "Contact seals add drag and heat: 61807-2RS-NSK runs slower and cooler-limited than the open 61807; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61807-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61807-2RS-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61807-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6807DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 35 mm bore puts 61807 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61807 at 5.4 kN dynamic (C) and 4.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 27 g, 61807 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 5.4/4.1 kN load ratings, mass 27 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6807DD on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61807; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-2RS-NSK bearing?",
        "a": "A 61807-2RS-NSK deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61807 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61807 uses the same ISO 15 envelope (35×47×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61807-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61807-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61807 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61807?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6807DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×47×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61807 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807-2RS",
      "61807-2rs",
      "6807DD",
      "NSK 6807DD",
      "61807-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6807VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.4,
    "static_load_kN": 4.1,
    "weight_g": 27,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6807VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 35 mm shaft for 61807 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.",
      "RSR low-friction seals on 61807-RSR-NSK run faster than contact-seal 61807-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61807-2RS instead.",
      "The non-contact lip of 61807-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 61807-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6807VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 35 mm bore puts 61807 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61807 at 5.4 kN dynamic (C) and 4.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 27 g, 61807 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 5.4/4.1 kN load ratings, mass 27 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6807VV on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-RSR-NSK bearing?",
        "a": "A 61807-RSR-NSK deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61807-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61807-RSR-NSK need?",
        "a": "61807-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61807 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61807?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6807VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×47×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6807VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807-RSR",
      "61807-rsr",
      "6807VV",
      "NSK 6807VV",
      "61807-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6807ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.4,
    "static_load_kN": 4.1,
    "weight_g": 27,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61807-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6807ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61807-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 35 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6207.",
      "ZZ shields are non-contact: 61807-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61807-2RS for that.",
      "Shielded 61807-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6807ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 35 mm bore puts 61807 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61807 at 5.4 kN dynamic (C) and 4.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 27 g, 61807 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 5.4/4.1 kN load ratings, mass 27 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6807ZZ on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61807 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-ZZ bearing?",
        "a": "A 61807-ZZ deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61807-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61800 compare with other series at the same 35 mm bore?",
        "a": "618 is an extra-thin section: 47×7 mm, only 6.0 mm radial section at 35 mm bore, far smaller than a 6207, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61807?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6807ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×47×7 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6807ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807-ZZ",
      "61807-zz",
      "6807ZZ",
      "NSK 6807ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61807-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6807",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 47,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.4,
    "static_load_kN": 4.1,
    "weight_g": 27,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61807 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 47 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61807-NSK.",
      "The 618xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6207.",
      "The open 61807-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 35×47×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61807 units.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61807-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61807 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 35 mm bore puts 61807 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61807 at 5.4 kN dynamic (C) and 4.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 27 g, 61807 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 35×47×7 mm envelope of 61807 gives a D/d ratio of 1.34 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 5.4/4.1 kN load ratings, mass 27 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6807 on the 35×47×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61807 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61807; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61807-NSK bearing?",
        "a": "A 61807-NSK deep-groove ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61807-NSK need?",
        "a": "The open 61807-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61807 bore code work?",
        "a": "The last two digits of 61807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61807?",
        "a": "NSK lists the open 61807 under the bare designation 6807; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61807 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61807-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61807-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61807-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×47×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61807",
      "6807",
      "NSK 6807",
      "61807-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6808DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 5.55,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6808DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61808-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "Contact seals add drag and heat: 61808-2RS-NSK runs slower and cooler-limited than the open 61808; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61808-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61808-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6808DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 40 mm bore puts 61808 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61808 at 7 kN dynamic (C) and 5.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 61808 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7/5.55 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6808DD on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-2RS-NSK bearing?",
        "a": "A 61808-2RS-NSK deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61808-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61808-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61808-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61808?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6808DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×52×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61808 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808-2RS",
      "61808-2rs",
      "6808DD",
      "NSK 6808DD",
      "61808-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6808VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 5.55,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61808-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 52 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6808VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61808-RSR-NSK.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "RSR low-friction seals on 61808-RSR-NSK run faster than contact-seal 61808-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61808-2RS instead.",
      "The low-drag lip of 61808-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 61808-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6808VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 40 mm bore puts 61808 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61808 at 7 kN dynamic (C) and 5.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 61808 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7/5.55 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6808VV on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61808; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-RSR-NSK bearing?",
        "a": "A 61808-RSR-NSK deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61808-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61808-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61808-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61808?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6808VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×52×7 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6808VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808-RSR",
      "61808-rsr",
      "6808VV",
      "NSK 6808VV",
      "61808-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6808ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 5.55,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61808-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 52 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6808ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61808-ZZ.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "ZZ shields are non-contact: 61808-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61808-2RS for that.",
      "Do not wash 61808-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-C3. No clearance suffix means normal CN clearance.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6808ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 40 mm bore puts 61808 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61808 at 7 kN dynamic (C) and 5.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 61808 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7/5.55 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6808ZZ on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-ZZ bearing?",
        "a": "A 61808-ZZ deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61808-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61808-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61808 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61808-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61808?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6808ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×52×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61808 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808-ZZ",
      "61808-zz",
      "6808ZZ",
      "NSK 6808ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61808-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6808",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 52,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 5.55,
    "weight_g": 31,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61808 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 52 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 40 mm shaft for 61808 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "Only 6.0 mm of radial section separates bore and OD on the 618xx series at 40 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6208.",
      "The open 61808-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 40×52×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61808 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61808-NSK-C3. No clearance suffix means normal CN clearance.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61808 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 40 mm bore puts 61808 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61808 at 7 kN dynamic (C) and 5.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 31 g, 61808 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 40×52×7 mm envelope of 61808 gives a D/d ratio of 1.30 and only 6.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7/5.55 kN load ratings, mass 31 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6808 on the 40×52×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61808 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61808 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61808-NSK bearing?",
        "a": "A 61808-NSK deep-groove ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61808-NSK need?",
        "a": "The open 61808-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61808 bore code work?",
        "a": "The last two digits of 61808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61808?",
        "a": "NSK lists the open 61808 under the bare designation 6808; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6808 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61808-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61808-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×52×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61808",
      "6808",
      "NSK 6808",
      "61808-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61809-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6809DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 58,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.25,
    "static_load_kN": 6.15,
    "weight_g": 38,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61809-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6809DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61809-2RS-NSK.",
      "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.",
      "Contact seals add drag and heat: 61809-2RS-NSK runs slower and cooler-limited than the open 61809; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61809-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61809-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6809DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 45 mm bore puts 61809 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61809 at 7.25 kN dynamic (C) and 6.15 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 38 g, 61809 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.25/6.15 kN load ratings, mass 38 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6809DD on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61809; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61809-2RS-NSK bearing?",
        "a": "A 61809-2RS-NSK deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61800 compare with other series at the same 45 mm bore?",
        "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61809 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61809 uses the same ISO 15 envelope (45×58×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61809?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6809DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×58×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6809DD keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61809-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61809-2RS",
      "61809-2rs",
      "6809DD",
      "NSK 6809DD",
      "61809-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61809-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6809VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 58,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.25,
    "static_load_kN": 6.15,
    "weight_g": 38,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6809VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.",
      "RSR low-friction seals on 61809-RSR-NSK run faster than contact-seal 61809-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61809-2RS instead.",
      "The low-drag lip of 61809-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6809VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 45 mm bore puts 61809 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61809 at 7.25 kN dynamic (C) and 6.15 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 38 g, 61809 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.25/6.15 kN load ratings, mass 38 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6809VV on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61809-RSR-NSK bearing?",
        "a": "A 61809-RSR-NSK deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61809-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61809-RSR-NSK need?",
        "a": "61809-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61809 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61809?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6809VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×58×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6809VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61809-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61809-RSR",
      "61809-rsr",
      "6809VV",
      "NSK 6809VV",
      "61809-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61809-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6809ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 58,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.25,
    "static_load_kN": 6.15,
    "weight_g": 38,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61809-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6809ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 45 mm shaft for 61809 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 618xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6209.",
      "ZZ shields are non-contact: 61809-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61809-2RS for that.",
      "Do not wash 61809-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6809ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 45 mm bore puts 61809 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61809 at 7.25 kN dynamic (C) and 6.15 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 38 g, 61809 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.25/6.15 kN load ratings, mass 38 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6809ZZ on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61809 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61809-ZZ bearing?",
        "a": "A 61809-ZZ deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61809 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61809 uses the same ISO 15 envelope (45×58×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61809-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61809-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61809 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61809?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6809ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×58×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61809 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61809-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61809-ZZ",
      "61809-zz",
      "6809ZZ",
      "NSK 6809ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61809-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6809",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 58,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.25,
    "static_load_kN": 6.15,
    "weight_g": 38,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61809 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 58 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61809-NSK.",
      "Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.",
      "Storage matters for open bearings: 61809-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61809 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 58 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61809-NSK.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 61809 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 45 mm bore puts 61809 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61809 at 7.25 kN dynamic (C) and 6.15 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 38 g, 61809 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 45×58×7 mm envelope of 61809 gives a D/d ratio of 1.29 and only 6.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.25/6.15 kN load ratings, mass 38 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6809 on the 45×58×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61809 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61809-NSK bearing?",
        "a": "A 61809-NSK deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61809 mean?",
        "a": "A bare 61809 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 45 mm bore?",
        "a": "618 is an extra-thin section: 58×7 mm, only 6.5 mm radial section at 45 mm bore, far smaller than a 6209, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61809?",
        "a": "NSK lists the open 61809 under the bare designation 6809; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 45 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6809 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61809-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61809-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×58×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61809",
      "6809",
      "NSK 6809",
      "61809-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61810-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6810DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 65,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.05,
    "static_load_kN": 6.2,
    "weight_g": 50,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6810DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61810 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.",
      "Heat is the enemy of the sealed 61810-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61810-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61810-2RS-NSK drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6810DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 50 mm bore puts 61810 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61810 at 7.05 kN dynamic (C) and 6.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 50 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.05/6.2 kN load ratings, mass 50 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6810DDU on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61810 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61810-2RS-NSK bearing?",
        "a": "A 61810-2RS-NSK deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61810 bore code work?",
        "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61810-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61810?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6810DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×65×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6810DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61810-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61810-2RS",
      "61810-2rs",
      "6810DDU",
      "NSK 6810DDU",
      "61810-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61810-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6810VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 65,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.05,
    "static_load_kN": 6.2,
    "weight_g": 50,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6810VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.",
      "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.",
      "The low-drag lip of 61810-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61810-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.",
      "Vibration during standstill brinells the raceways of a 50 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61810-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6810VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 50 mm bore puts 61810 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61810 at 7.05 kN dynamic (C) and 6.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 50 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.05/6.2 kN load ratings, mass 50 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6810VV on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61810 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61810-RSR-NSK bearing?",
        "a": "A 61810-RSR-NSK deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61810 bore code work?",
        "a": "The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61810-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61810?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6810VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×65×7 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6810VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61810-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61810-RSR",
      "61810-rsr",
      "6810VV",
      "NSK 6810VV",
      "61810-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61810-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6810ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 65,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.05,
    "static_load_kN": 6.2,
    "weight_g": 50,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6810ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.",
      "Do not wash 61810-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61810-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 61810-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6810ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 50 mm bore puts 61810 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61810 at 7.05 kN dynamic (C) and 6.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 50 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.05/6.2 kN load ratings, mass 50 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6810ZZ on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61810-ZZ bearing?",
        "a": "A 61810-ZZ deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 50 mm bore?",
        "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61810 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61810 uses the same ISO 15 envelope (50×65×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61810?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6810ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×65×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6810ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61810-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61810-ZZ",
      "61810-zz",
      "6810ZZ",
      "NSK 6810ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61810-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6810",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 65,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.05,
    "static_load_kN": 6.2,
    "weight_g": 50,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61810 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 65 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61810 with C3 clearance and re-check the residual value after mounting.",
      "Only 7.5 mm of radial section separates bore and OD on the 618xx series at 50 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.",
      "The open 61810-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 50×65×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61810 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The housing bore for the 65 mm OD should be round within IT7; an oval bore pinches the outer ring of 61810-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61810 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 50 mm bore puts 61810 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61810 at 7.05 kN dynamic (C) and 6.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 50 g, 61810 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×65×7 mm envelope of 61810 gives a D/d ratio of 1.30 and only 7.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 7.05/6.2 kN load ratings, mass 50 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6810 on the 50×65×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61810 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61810-NSK bearing?",
        "a": "A 61810-NSK deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 50 mm bore?",
        "a": "618 is an extra-thin section: 65×7 mm, only 7.5 mm radial section at 50 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61810 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61810 uses the same ISO 15 envelope (50×65×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61810?",
        "a": "NSK lists the open 61810 under the bare designation 6810; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 50 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61810 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61810-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61810-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61810-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×65×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61810",
      "6810",
      "NSK 6810",
      "61810-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61811-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6811DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 72,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 9.7,
    "static_load_kN": 8.5,
    "weight_g": 81,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61811-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6811DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61811 with C3 for those conditions.",
      "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.",
      "Contact seals add drag and heat: 61811-2RS-NSK runs slower and cooler-limited than the open 61811; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61811-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 61811-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61811-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6811DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 55 mm bore 61811 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61811 at 9.7 kN dynamic (C) and 8.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 81 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 9.7/8.5 kN load ratings, mass 81 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6811DDU on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61811 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61811-2RS-NSK bearing?",
        "a": "A 61811-2RS-NSK deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61811 bore code work?",
        "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61811-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61811?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6811DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×72×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6811DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61811-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61811-2RS",
      "61811-2rs",
      "6811DDU",
      "NSK 6811DDU",
      "61811-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61811-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6811VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 72,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 9.7,
    "static_load_kN": 8.5,
    "weight_g": 81,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6811VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.",
      "The low-drag lip of 61811-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61811-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61811-RSR-NSK.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61811-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6811VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 55 mm bore 61811 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61811 at 9.7 kN dynamic (C) and 8.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 81 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 9.7/8.5 kN load ratings, mass 81 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6811VV on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61811 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61811-RSR-NSK bearing?",
        "a": "A 61811-RSR-NSK deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61811-RSR-NSK need?",
        "a": "61811-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61811 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61811 bore code work?",
        "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61811?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6811VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×72×9 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61811 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61811-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61811-RSR",
      "61811-rsr",
      "6811VV",
      "NSK 6811VV",
      "61811-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61811-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6811ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 72,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 9.7,
    "static_load_kN": 8.5,
    "weight_g": 81,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61811-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6811ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.",
      "Only 8.5 mm of radial section separates bore and OD on the 618xx series at 55 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6211.",
      "Do not wash 61811-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61811-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 61811-ZZ drags the lip and overheats it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6811ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 55 mm bore 61811 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61811 at 9.7 kN dynamic (C) and 8.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 81 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 9.7/8.5 kN load ratings, mass 81 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6811ZZ on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61811-ZZ bearing?",
        "a": "A 61811-ZZ deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61811 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61811 uses the same ISO 15 envelope (55×72×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61811-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61811-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61811 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61811?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6811ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×72×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6811ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61811-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61811-ZZ",
      "61811-zz",
      "6811ZZ",
      "NSK 6811ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61811-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6811",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 72,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 9.7,
    "static_load_kN": 8.5,
    "weight_g": 81,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61811 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 72 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61811 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6211.",
      "Storage matters for open bearings: 61811-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61811 units.",
      "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61811-NSK and shows up later as two-point loaded raceway wear.",
      "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61811 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 55 mm bore 61811 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61811 at 9.7 kN dynamic (C) and 8.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 81 g, 61811 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×72×9 mm envelope of 61811 gives a D/d ratio of 1.31 and only 8.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 9.7/8.5 kN load ratings, mass 81 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6811 on the 55×72×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61811 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61811 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61811-NSK bearing?",
        "a": "A 61811-NSK deep-groove ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61811-NSK need?",
        "a": "The open 61811-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61811 bore code work?",
        "a": "The last two digits of 61811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61811?",
        "a": "NSK lists the open 61811 under the bare designation 6811; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61811 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61811-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61811-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×72×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61811",
      "6811",
      "NSK 6811",
      "61811-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61812-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6812DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 78,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 10.9,
    "weight_g": 103,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6812DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61812 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.",
      "Heat is the enemy of the sealed 61812-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61812-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 78 mm OD should be round within IT7; an oval bore pinches the outer ring of 61812-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6812DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 60 mm bore 61812 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61812 at 12.6 kN dynamic (C) and 10.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 103 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 12.6/10.9 kN load ratings, mass 103 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6812DD on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61812; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61812-2RS-NSK bearing?",
        "a": "A 61812-2RS-NSK deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61800 compare with other series at the same 60 mm bore?",
        "a": "618 is an extra-thin section: 78×10 mm, only 9.0 mm radial section at 60 mm bore, far smaller than a 6212, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61812 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61812 uses the same ISO 15 envelope (60×78×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61812?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6812DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×78×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61812 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61812-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61812-2RS",
      "61812-2rs",
      "6812DD",
      "NSK 6812DD",
      "61812-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61812-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6812VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 78,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 10.9,
    "weight_g": 103,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61812-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6812VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61812 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.",
      "RSR low-friction seals on 61812-RSR-NSK run faster than contact-seal 61812-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61812-2RS instead.",
      "The low-drag lip of 61812-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 60 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61812-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6812VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 60 mm bore 61812 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61812 at 12.6 kN dynamic (C) and 10.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 103 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 12.6/10.9 kN load ratings, mass 103 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6812VV on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61812-RSR-NSK bearing?",
        "a": "A 61812-RSR-NSK deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 61812 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61812 uses the same ISO 15 envelope (60×78×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61812-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61812-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61812 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61812?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6812VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×78×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6812VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61812-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61812-RSR",
      "61812-rsr",
      "6812VV",
      "NSK 6812VV",
      "61812-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61812-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6812ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 78,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 10.9,
    "weight_g": 103,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6812ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61812 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Only 9.0 mm of radial section separates bore and OD on the 618xx series at 60 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.",
      "ZZ shields are non-contact: 61812-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61812-2RS for that.",
      "Do not wash 61812-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6812ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 60 mm bore 61812 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61812 at 12.6 kN dynamic (C) and 10.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 103 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 12.6/10.9 kN load ratings, mass 103 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6812ZZ on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61812 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61812; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61812-ZZ bearing?",
        "a": "A 61812-ZZ deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61812 bore code work?",
        "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61812-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61812?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6812ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×78×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6812ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61812-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61812-ZZ",
      "61812-zz",
      "6812ZZ",
      "NSK 6812ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61812-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6812",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 78,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 10.9,
    "weight_g": 103,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61812 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 78 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61812 with C3 for those conditions.",
      "The 618xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.",
      "The open 61812-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 60×78×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61812 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61812 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 60 mm bore 61812 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61812 at 12.6 kN dynamic (C) and 10.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 103 g, 61812 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×78×10 mm envelope of 61812 gives a D/d ratio of 1.30 and only 9.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 12.6/10.9 kN load ratings, mass 103 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6812 on the 60×78×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61812 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61812; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61812-NSK bearing?",
        "a": "A 61812-NSK deep-groove ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61812 bore code work?",
        "a": "The last two digits of 61812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61812 mean?",
        "a": "A bare 61812 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61812?",
        "a": "NSK lists the open 61812 under the bare designation 6812; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 60 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61812 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61812-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61812-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×78×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61812",
      "6812",
      "NSK 6812",
      "61812-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61813-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6813DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 85,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.1,
    "static_load_kN": 12.1,
    "weight_g": 128,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61813-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6813DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61813 with C3 clearance and re-check the residual value after mounting.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.",
      "Contact seals add drag and heat: 61813-2RS-NSK runs slower and cooler-limited than the open 61813; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61813-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 85 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61813-2RS-NSK.",
      "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6813DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 65 mm bore 61813 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61813 at 13.1 kN dynamic (C) and 12.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.1/12.1 kN load ratings, mass 128 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6813DD on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61813 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61813-2RS-NSK bearing?",
        "a": "A 61813-2RS-NSK deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61813 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61813-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61813-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61813?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6813DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×85×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61813 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61813-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61813-2RS",
      "61813-2rs",
      "6813DD",
      "NSK 6813DD",
      "61813-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61813-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6813VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 85,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.1,
    "static_load_kN": 12.1,
    "weight_g": 128,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61813-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6813VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61813 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.",
      "The low-drag lip of 61813-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61813-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6813VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 65 mm bore 61813 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61813 at 13.1 kN dynamic (C) and 12.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.1/12.1 kN load ratings, mass 128 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6813VV on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61813-RSR-NSK bearing?",
        "a": "A 61813-RSR-NSK deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61813-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61813-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61813-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61813?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6813VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×85×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61813 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61813-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61813-RSR",
      "61813-rsr",
      "6813VV",
      "NSK 6813VV",
      "61813-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61813-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6813ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 85,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.1,
    "static_load_kN": 12.1,
    "weight_g": 128,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61813-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6813ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61813 with C3 clearance and re-check the residual value after mounting.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 65 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6213.",
      "ZZ shields are non-contact: 61813-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61813-2RS for that.",
      "Shielded 61813-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61813-ZZ drags the lip and overheats it.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6813ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 65 mm bore 61813 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61813 at 13.1 kN dynamic (C) and 12.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.1/12.1 kN load ratings, mass 128 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6813ZZ on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61813-ZZ bearing?",
        "a": "A 61813-ZZ deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61813-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61813-ZZ need?",
        "a": "61813-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61813?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6813ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×85×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6813ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61813-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61813-ZZ",
      "61813-zz",
      "6813ZZ",
      "NSK 6813ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61813-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6813",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 85,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.1,
    "static_load_kN": 12.1,
    "weight_g": 128,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61813 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 85 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61813 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6213.",
      "The open 61813-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 65×85×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61813-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61813 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 65 mm bore 61813 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61813 at 13.1 kN dynamic (C) and 12.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 128 g, 61813 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 65×85×10 mm envelope of 61813 gives a D/d ratio of 1.31 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.1/12.1 kN load ratings, mass 128 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6813 on the 65×85×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61813 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61813-NSK bearing?",
        "a": "A 61813-NSK deep-groove ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61813 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61813 uses the same ISO 15 envelope (65×85×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61813-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61813-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61813 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61813?",
        "a": "NSK lists the open 61813 under the bare designation 6813; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 65 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61813 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61813-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61813-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×85×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61813",
      "6813",
      "NSK 6813",
      "61813-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61814-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6814DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 90,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 12.7,
    "weight_g": 134,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6814DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61814 with C3 for those conditions.",
      "The 618xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6214.",
      "Contact seals add drag and heat: 61814-2RS-NSK runs slower and cooler-limited than the open 61814; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61814-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 61814-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6814DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 70 mm bore 61814 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61814 at 13.3 kN dynamic (C) and 12.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 134 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.3/12.7 kN load ratings, mass 134 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6814DD on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61814 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61814-2RS-NSK bearing?",
        "a": "A 61814-2RS-NSK deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61814-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61814-2RS-NSK need?",
        "a": "61814-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61814 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61814?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6814DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×90×10 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6814DD keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61814-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61814-2RS",
      "61814-2rs",
      "6814DD",
      "NSK 6814DD",
      "61814-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61814-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6814VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 90,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 12.7,
    "weight_g": 134,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6814VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61814 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.",
      "RSR low-friction seals on 61814-RSR-NSK run faster than contact-seal 61814-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61814-2RS instead.",
      "The non-contact lip of 61814-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61814-RSR-NSK.",
      "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6814VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 70 mm bore 61814 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61814 at 13.3 kN dynamic (C) and 12.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 134 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.3/12.7 kN load ratings, mass 134 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6814VV on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61814 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61814-RSR-NSK bearing?",
        "a": "A 61814-RSR-NSK deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61814-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61814-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61814 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61814-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61814?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6814VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×90×10 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6814VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61814-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61814-RSR",
      "61814-rsr",
      "6814VV",
      "NSK 6814VV",
      "61814-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61814-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6814ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 90,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 12.7,
    "weight_g": 134,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61814-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6814ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.",
      "ZZ shields are non-contact: 61814-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61814-2RS for that.",
      "Do not wash 61814-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61814-ZZ drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6814ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 70 mm bore 61814 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61814 at 13.3 kN dynamic (C) and 12.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 134 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.3/12.7 kN load ratings, mass 134 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6814ZZ on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61814-ZZ bearing?",
        "a": "A 61814-ZZ deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61814-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61800 compare with other series at the same 70 mm bore?",
        "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61814?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6814ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×90×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61814 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61814-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61814-ZZ",
      "61814-zz",
      "6814ZZ",
      "NSK 6814ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61814-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6814",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 90,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 12.7,
    "weight_g": 134,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61814 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 90 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61814 with C3 clearance and re-check the residual value after mounting.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 70 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6214.",
      "Storage matters for open bearings: 61814-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61814 units.",
      "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61814 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 70 mm bore 61814 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61814 at 13.3 kN dynamic (C) and 12.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 134 g, 61814 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 70×90×10 mm envelope of 61814 gives a D/d ratio of 1.29 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.3/12.7 kN load ratings, mass 134 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6814 on the 70×90×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61814 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61814; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61814-NSK bearing?",
        "a": "A 61814-NSK deep-groove ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 70 mm bore?",
        "a": "618 is an extra-thin section: 90×10 mm, only 10.0 mm radial section at 70 mm bore, far smaller than a 6214, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61814 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61814 uses the same ISO 15 envelope (70×90×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61814?",
        "a": "NSK lists the open 61814 under the bare designation 6814; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 70 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6814 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61814-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61814-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×90×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61814",
      "6814",
      "NSK 6814",
      "61814-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61815-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6815DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 95,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.8,
    "static_load_kN": 13.9,
    "weight_g": 149,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61815-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6815DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.",
      "Heat is the enemy of the sealed 61815-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61815-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61815-2RS-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the contact-sealed version as 6815DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 75 mm bore 61815 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61815 at 13.8 kN dynamic (C) and 13.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 149 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.8/13.9 kN load ratings, mass 149 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6815DDU on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61815-2RS-NSK bearing?",
        "a": "A 61815-2RS-NSK deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61815-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61815-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61815 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61815-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61815?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6815DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×95×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6815DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61815-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61815-2RS",
      "61815-2rs",
      "6815DDU",
      "NSK 6815DDU",
      "61815-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61815-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6815VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 95,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.8,
    "static_load_kN": 13.9,
    "weight_g": 149,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61815-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 95 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6815VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61815 against the shaft shoulder while it cools so the ring cannot creep back.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.",
      "RSR low-friction seals on 61815-RSR-NSK run faster than contact-seal 61815-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61815-2RS instead.",
      "The low-drag lip of 61815-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6815VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 75 mm bore 61815 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61815 at 13.8 kN dynamic (C) and 13.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 149 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.8/13.9 kN load ratings, mass 149 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6815VV on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61815-RSR-NSK bearing?",
        "a": "A 61815-RSR-NSK deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61815-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61815-RSR-NSK need?",
        "a": "61815-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61815 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61815?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6815VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×95×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6815VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61815-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61815-RSR",
      "61815-rsr",
      "6815VV",
      "NSK 6815VV",
      "61815-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61815-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6815ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 95,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.8,
    "static_load_kN": 13.9,
    "weight_g": 149,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6815ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61815 with C3 for those conditions.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 75 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.",
      "ZZ shields are non-contact: 61815-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61815-2RS for that.",
      "Shielded 61815-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6815ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 75 mm bore 61815 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61815 at 13.8 kN dynamic (C) and 13.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 149 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.8/13.9 kN load ratings, mass 149 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6815ZZ on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61815 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61815-ZZ bearing?",
        "a": "A 61815-ZZ deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61815-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61800 compare with other series at the same 75 mm bore?",
        "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61815?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6815ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×95×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61815 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61815-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61815-ZZ",
      "61815-zz",
      "6815ZZ",
      "NSK 6815ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61815-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6815",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 95,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.8,
    "static_load_kN": 13.9,
    "weight_g": 149,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61815 with C3 clearance and re-check the residual value after mounting.",
      "The 618xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.",
      "The open 61815-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 75×95×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61815 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61815 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 75 mm bore 61815 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61815 at 13.8 kN dynamic (C) and 13.9 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 149 g, 61815 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 75×95×10 mm envelope of 61815 gives a D/d ratio of 1.27 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.8/13.9 kN load ratings, mass 149 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6815 on the 75×95×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61815 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61815 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61815; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61815-NSK bearing?",
        "a": "A 61815-NSK deep-groove ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61815 mean?",
        "a": "A bare 61815 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 75 mm bore?",
        "a": "618 is an extra-thin section: 95×10 mm, only 10.0 mm radial section at 75 mm bore, far smaller than a 6215, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61815?",
        "a": "NSK lists the open 61815 under the bare designation 6815; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 75 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6815?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61815-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61815-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×95×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61815",
      "6815",
      "NSK 6815",
      "61815-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61816-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6816DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 100,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.9,
    "static_load_kN": 14.5,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6816DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 61816 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.",
      "Heat is the enemy of the sealed 61816-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61816-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61816-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6816DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 80 mm bore 61816 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61816 at 13.9 kN dynamic (C) and 14.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 151 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.9/14.5 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816DDU on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61816 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61816-2RS-NSK bearing?",
        "a": "A 61816-2RS-NSK deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61816-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61816-2RS-NSK need?",
        "a": "61816-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61816 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61816?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6816DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×100×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6816DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61816-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61816-2RS",
      "61816-2rs",
      "6816DDU",
      "NSK 6816DDU",
      "61816-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61816-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6816VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 100,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.9,
    "static_load_kN": 14.5,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6816VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 61816 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.",
      "RSR low-friction seals on 61816-RSR run faster than contact-seal 61816-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61816-2RS instead.",
      "The non-contact lip of 61816-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61816-RSR drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 80 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6816VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 80 mm bore 61816 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61816 at 13.9 kN dynamic (C) and 14.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 151 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.9/14.5 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816VV on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61816-RSR bearing?",
        "a": "A 61816-RSR deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61816-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61800 compare with other series at the same 80 mm bore?",
        "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61816?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6816VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×100×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61816 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61816-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61816-RSR",
      "61816-rsr",
      "6816VV",
      "NSK 6816VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61816-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6816ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 100,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.9,
    "static_load_kN": 14.5,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61816-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6816ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 10.0 mm of radial section separates bore and OD on the 618xx series at 80 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6216.",
      "Do not wash 61816-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61816-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61816-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61816-ZZ drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6816ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 80 mm bore 61816 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61816 at 13.9 kN dynamic (C) and 14.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 151 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.9/14.5 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816ZZ on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61816; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61816-ZZ bearing?",
        "a": "A 61816-ZZ deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61816-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61800 compare with other series at the same 80 mm bore?",
        "a": "618 is an extra-thin section: 100×10 mm, only 10.0 mm radial section at 80 mm bore, far smaller than a 6216, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61816?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6816ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×100×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6816ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61816-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61816-ZZ",
      "61816-zz",
      "6816ZZ",
      "NSK 6816ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61816-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6816",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 100,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 13.9,
    "static_load_kN": 14.5,
    "weight_g": 151,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61816 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 100 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 80 mm of 61816-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6216.",
      "The open 61816-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 80×100×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61816 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61816-NSK drags the lip and overheats it.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61816-NSK.",
      "The open 61816 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 80 mm bore 61816 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61816 at 13.9 kN dynamic (C) and 14.5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 151 g, 61816 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 80×100×10 mm envelope of 61816 gives a D/d ratio of 1.25 and only 10.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 13.9/14.5 kN load ratings, mass 151 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6816 on the 80×100×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61816 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61816 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61816-NSK bearing?",
        "a": "A 61816-NSK deep-groove ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61816-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61816-NSK need?",
        "a": "The open 61816-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61816?",
        "a": "NSK lists the open 61816 under the bare designation 6816; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 80 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6816?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61816-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61816-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×100×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61816",
      "6816",
      "NSK 6816",
      "61816-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61817-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6817DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 110,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.6,
    "static_load_kN": 20,
    "weight_g": 263,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61817-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6817DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.",
      "Heat is the enemy of the sealed 61817-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61817-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61817-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61817-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6817DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 85 mm bore 61817 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.6 kN dynamic load rating (C) and 20 kN static (C0), 61817 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 263 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.6/20 kN load ratings, mass 263 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6817DDU on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61817 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61817-2RS-NSK bearing?",
        "a": "A 61817-2RS-NSK deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61817 bore code work?",
        "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61817-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61817?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6817DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×110×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61817 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61817-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61817-2RS",
      "61817-2rs",
      "6817DDU",
      "NSK 6817DDU",
      "61817-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61817-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6817VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 110,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.6,
    "static_load_kN": 20,
    "weight_g": 263,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6817VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 85 mm bore the ring mass is significant: heat 61817 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.",
      "RSR low-friction seals on 61817-RSR-NSK run faster than contact-seal 61817-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61817-2RS instead.",
      "The low-drag lip of 61817-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61817-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6817VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 85 mm bore 61817 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.6 kN dynamic load rating (C) and 20 kN static (C0), 61817 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 263 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.6/20 kN load ratings, mass 263 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6817VV on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61817-RSR-NSK bearing?",
        "a": "A 61817-RSR-NSK deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61817-RSR-NSK need?",
        "a": "61817-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61817 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61817 bore code work?",
        "a": "The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61817?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6817VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×110×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6817VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61817-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61817-RSR",
      "61817-rsr",
      "6817VV",
      "NSK 6817VV",
      "61817-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61817-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6817ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 110,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.6,
    "static_load_kN": 20,
    "weight_g": 263,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6817ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.",
      "ZZ shields are non-contact: 61817-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61817-2RS for that.",
      "Shielded 61817-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 61817-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61817-ZZ.",
      "NSK catalogues the shielded version as 6817ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 85 mm bore 61817 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.6 kN dynamic load rating (C) and 20 kN static (C0), 61817 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 263 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.6/20 kN load ratings, mass 263 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6817ZZ on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61817-ZZ bearing?",
        "a": "A 61817-ZZ deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 85 mm bore?",
        "a": "618 is an extra-thin section: 110×13 mm, only 12.5 mm radial section at 85 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61817 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61817 uses the same ISO 15 envelope (85×110×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61817?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6817ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×110×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61817 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61817-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61817-ZZ",
      "61817-zz",
      "6817ZZ",
      "NSK 6817ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61817-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6817",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 110,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.6,
    "static_load_kN": 20,
    "weight_g": 263,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61817 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 110 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6217.",
      "Storage matters for open bearings: 61817-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61817 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61817-NSK.",
      "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 61817 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 85 mm bore 61817 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.6 kN dynamic load rating (C) and 20 kN static (C0), 61817 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 263 g, 61817 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×110×13 mm envelope of 61817 gives a D/d ratio of 1.29 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.6/20 kN load ratings, mass 263 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6817 on the 85×110×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61817 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61817-NSK bearing?",
        "a": "A 61817-NSK deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61817-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61817-NSK need?",
        "a": "The open 61817-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61817?",
        "a": "NSK lists the open 61817 under the bare designation 6817; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 85 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6817?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61817-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61817-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×110×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61817",
      "6817",
      "NSK 6817",
      "61817-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61818-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6818DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 115,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.9,
    "static_load_kN": 21,
    "weight_g": 276,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61818-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6818DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 61818-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.",
      "Contact seals add drag and heat: 61818-2RS-NSK runs slower and cooler-limited than the open 61818; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61818-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-2RS-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the contact-sealed version as 6818DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 90 mm bore 61818 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.9 kN dynamic load rating (C) and 21 kN static (C0), 61818 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 276 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.9/21 kN load ratings, mass 276 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6818DDU on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61818; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61818-2RS-NSK bearing?",
        "a": "A 61818-2RS-NSK deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61818-2RS-NSK need?",
        "a": "61818-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61818 bore code work?",
        "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61818?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6818DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×115×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61818 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61818-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61818-2RS",
      "61818-2rs",
      "6818DDU",
      "NSK 6818DDU",
      "61818-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61818-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6818VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 115,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.9,
    "static_load_kN": 21,
    "weight_g": 276,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61818-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6818VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.",
      "The low-drag lip of 61818-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61818-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61818-RSR-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6818VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 90 mm bore 61818 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.9 kN dynamic load rating (C) and 21 kN static (C0), 61818 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 276 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.9/21 kN load ratings, mass 276 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6818VV on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61818 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61818-RSR-NSK bearing?",
        "a": "A 61818-RSR-NSK deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61818-RSR-NSK need?",
        "a": "61818-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61818 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61818 bore code work?",
        "a": "The last two digits of 61818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61818?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6818VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×115×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61818 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61818-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61818-RSR",
      "61818-rsr",
      "6818VV",
      "NSK 6818VV",
      "61818-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61818-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6818ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 115,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.9,
    "static_load_kN": 21,
    "weight_g": 276,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6818ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 61818 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6218.",
      "ZZ shields are non-contact: 61818-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61818-2RS for that.",
      "Shielded 61818-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-ZZ.",
      "NSK catalogues the shielded version as 6818ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 90 mm bore 61818 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.9 kN dynamic load rating (C) and 21 kN static (C0), 61818 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 276 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.9/21 kN load ratings, mass 276 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6818ZZ on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61818-ZZ bearing?",
        "a": "A 61818-ZZ deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 90 mm bore?",
        "a": "618 is an extra-thin section: 115×13 mm, only 12.5 mm radial section at 90 mm bore, far smaller than a 6218, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61818 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61818?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6818ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×115×13 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6818ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61818-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61818-ZZ",
      "61818-zz",
      "6818ZZ",
      "NSK 6818ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61818-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6818",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 115,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 20.9,
    "static_load_kN": 21,
    "weight_g": 276,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61818 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 115 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 61818 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 90 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6218.",
      "The open 61818-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 90×115×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61818-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 115 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61818-NSK.",
      "The open 61818 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 90 mm bore 61818 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 20.9 kN dynamic load rating (C) and 21 kN static (C0), 61818 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 276 g, 61818 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×115×13 mm envelope of 61818 gives a D/d ratio of 1.28 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 20.9/21 kN load ratings, mass 276 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6818 on the 90×115×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61818 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61818-NSK bearing?",
        "a": "A 61818-NSK deep-groove ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61818 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61818 uses the same ISO 15 envelope (90×115×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61818-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61818-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61818 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61818?",
        "a": "NSK lists the open 61818 under the bare designation 6818; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 90 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61818 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61818-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61818-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×115×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61818",
      "6818",
      "NSK 6818",
      "61818-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61819-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6819DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 120,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.2,
    "static_load_kN": 22,
    "weight_g": 297,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61819-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6819DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.",
      "Contact seals add drag and heat: 61819-2RS-NSK runs slower and cooler-limited than the open 61819; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61819-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "The housing bore for the 120 mm OD should be round within IT7; an oval bore pinches the outer ring of 61819-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6819DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 95 mm bore 61819 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.2 kN dynamic load rating (C) and 22 kN static (C0), 61819 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 297 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.2/22 kN load ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819DD on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61819-2RS-NSK bearing?",
        "a": "A 61819-2RS-NSK deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61800 compare with other series at the same 95 mm bore?",
        "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61819 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61819?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6819DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×120×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61819 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61819-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61819-2RS",
      "61819-2rs",
      "6819DD",
      "NSK 6819DD",
      "61819-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61819-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6819VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 120,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.2,
    "static_load_kN": 22,
    "weight_g": 297,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6819VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 61819-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.",
      "RSR low-friction seals on 61819-RSR run faster than contact-seal 61819-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61819-2RS instead.",
      "The low-drag lip of 61819-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 61819-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61819-RSR drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6819VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 95 mm bore 61819 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.2 kN dynamic load rating (C) and 22 kN static (C0), 61819 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 297 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.2/22 kN load ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819VV on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61819 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61819-RSR bearing?",
        "a": "A 61819-RSR deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61800 compare with other series at the same 95 mm bore?",
        "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61819 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61819?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6819VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×120×13 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6819VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61819-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61819-RSR",
      "61819-rsr",
      "6819VV",
      "NSK 6819VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61819-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6819ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 120,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.2,
    "static_load_kN": 22,
    "weight_g": 297,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61819-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6819ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 61819-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 95 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6219.",
      "ZZ shields are non-contact: 61819-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61819-2RS for that.",
      "Shielded 61819-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6819ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 95 mm bore 61819 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.2 kN dynamic load rating (C) and 22 kN static (C0), 61819 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 297 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.2/22 kN load ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819ZZ on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61819-ZZ bearing?",
        "a": "A 61819-ZZ deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 95 mm bore?",
        "a": "618 is an extra-thin section: 120×13 mm, only 12.5 mm radial section at 95 mm bore, far smaller than a 6219, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61819 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61819?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6819ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×120×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6819ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61819-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61819-ZZ",
      "61819-zz",
      "6819ZZ",
      "NSK 6819ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61819-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6819",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 120,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.2,
    "static_load_kN": 22,
    "weight_g": 297,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61819 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 120 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6219.",
      "Storage matters for open bearings: 61819-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61819 units.",
      "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61819-NSK.",
      "The open 61819 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 95 mm bore 61819 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.2 kN dynamic load rating (C) and 22 kN static (C0), 61819 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 297 g, 61819 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×120×13 mm envelope of 61819 gives a D/d ratio of 1.26 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.2/22 kN load ratings, mass 297 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6819 on the 95×120×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61819 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61819-NSK bearing?",
        "a": "A 61819-NSK deep-groove ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61819 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61819 uses the same ISO 15 envelope (95×120×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61819-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61819-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61819 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61819?",
        "a": "NSK lists the open 61819 under the bare designation 6819; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 95 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6819 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61819-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61819-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×120×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61819",
      "6819",
      "NSK 6819",
      "61819-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61820-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6820DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 125,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.5,
    "static_load_kN": 23,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6820DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.",
      "Heat is the enemy of the sealed 61820-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61820-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6820DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 100 mm bore 61820 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.5 kN dynamic load rating (C) and 23 kN static (C0), 61820 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 310 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.5/23 kN load ratings, mass 310 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6820DD on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61820-2RS-NSK bearing?",
        "a": "A 61820-2RS-NSK deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61820-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61820-2RS-NSK need?",
        "a": "61820-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61820 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61820?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6820DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×125×13 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6820DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61820-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61820-2RS",
      "61820-2rs",
      "6820DD",
      "NSK 6820DD",
      "61820-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61820-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6820VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 125,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.5,
    "static_load_kN": 23,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6820VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 100 mm bore the ring mass is significant: heat 61820 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.",
      "The low-drag lip of 61820-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61820-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Never mix components between two 61820-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues this low-friction non-contact seal as 6820VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 100 mm bore 61820 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.5 kN dynamic load rating (C) and 23 kN static (C0), 61820 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 310 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.5/23 kN load ratings, mass 310 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6820VV on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61820-RSR-NSK bearing?",
        "a": "A 61820-RSR-NSK deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61820-RSR-NSK need?",
        "a": "61820-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61820 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61820 bore code work?",
        "a": "The last two digits of 61820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61820?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6820VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×125×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61820 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61820-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61820-RSR",
      "61820-rsr",
      "6820VV",
      "NSK 6820VV",
      "61820-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61820-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6820ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 125,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.5,
    "static_load_kN": 23,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61820-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 125 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6820ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 100 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6220.",
      "ZZ shields are non-contact: 61820-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61820-2RS for that.",
      "Shielded 61820-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61820-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 125 mm OD should be round within IT7; an oval bore pinches the outer ring of 61820-ZZ and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6820ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 100 mm bore 61820 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.5 kN dynamic load rating (C) and 23 kN static (C0), 61820 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 310 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.5/23 kN load ratings, mass 310 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6820ZZ on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61820-ZZ bearing?",
        "a": "A 61820-ZZ deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61820-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61820-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61820 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61820-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61820?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6820ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×125×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6820ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61820-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61820-ZZ",
      "61820-zz",
      "6820ZZ",
      "NSK 6820ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61820-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6820",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 125,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.5,
    "static_load_kN": 23,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6220.",
      "Storage matters for open bearings: 61820-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61820 units.",
      "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61820-NSK.",
      "The housing bore for the 125 mm OD should be round within IT7; an oval bore pinches the outer ring of 61820-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61820 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 100 mm bore 61820 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.5 kN dynamic load rating (C) and 23 kN static (C0), 61820 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 310 g, 61820 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×125×13 mm envelope of 61820 gives a D/d ratio of 1.25 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.5/23 kN load ratings, mass 310 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6820 on the 100×125×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61820 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61820; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61820-NSK bearing?",
        "a": "A 61820-NSK deep-groove ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61820 mean?",
        "a": "A bare 61820 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 100 mm bore?",
        "a": "618 is an extra-thin section: 125×13 mm, only 12.5 mm radial section at 100 mm bore, far smaller than a 6220, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61820?",
        "a": "NSK lists the open 61820 under the bare designation 6820; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 100 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6820 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61820-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61820-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×125×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61820",
      "6820",
      "NSK 6820",
      "61820-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61821-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6821DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 130,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.8,
    "static_load_kN": 23.9,
    "weight_g": 324,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6821DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 61821-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 12.5 mm of radial section separates bore and OD on the 618xx series at 105 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6221.",
      "Contact seals add drag and heat: 61821-2RS-NSK runs slower and cooler-limited than the open 61821; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61821-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 61821-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6821DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 105 mm bore 61821 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.8 kN dynamic load rating (C) and 23.9 kN static (C0), 61821 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 324 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.8/23.9 kN load ratings, mass 324 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6821DDU on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61821-2RS-NSK bearing?",
        "a": "A 61821-2RS-NSK deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61821-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61821-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61821-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61821?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6821DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×130×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6821DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61821-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61821-2RS",
      "61821-2rs",
      "6821DDU",
      "NSK 6821DDU",
      "61821-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61821-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6821VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 130,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.8,
    "static_load_kN": 23.9,
    "weight_g": 324,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61821-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6821VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 61821-RSR-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.",
      "RSR low-friction seals on 61821-RSR-NSK run faster than contact-seal 61821-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61821-2RS instead.",
      "The non-contact lip of 61821-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61821-RSR-NSK drags the lip and overheats it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6821VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 105 mm bore 61821 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.8 kN dynamic load rating (C) and 23.9 kN static (C0), 61821 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 324 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.8/23.9 kN load ratings, mass 324 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6821VV on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61821; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61821-RSR-NSK bearing?",
        "a": "A 61821-RSR-NSK deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61800 compare with other series at the same 105 mm bore?",
        "a": "618 is an extra-thin section: 130×13 mm, only 12.5 mm radial section at 105 mm bore, far smaller than a 6221, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61821 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61821 uses the same ISO 15 envelope (105×130×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61821?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6821VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×130×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61821 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61821-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61821-RSR",
      "61821-rsr",
      "6821VV",
      "NSK 6821VV",
      "61821-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61821-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6821ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 130,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.8,
    "static_load_kN": 23.9,
    "weight_g": 324,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61821-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 130 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6821ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 105 mm bore the ring mass is significant: heat 61821 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.",
      "ZZ shields are non-contact: 61821-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61821-2RS for that.",
      "Do not wash 61821-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6821ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 105 mm bore 61821 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.8 kN dynamic load rating (C) and 23.9 kN static (C0), 61821 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 324 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.8/23.9 kN load ratings, mass 324 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6821ZZ on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61821-ZZ bearing?",
        "a": "A 61821-ZZ deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61821 bore code work?",
        "a": "The last two digits of 61821 are bore code 21, giving 21 × 5 = 105 mm bore. The 130 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61821-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61821?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6821ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×130×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6821ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61821-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61821-ZZ",
      "61821-zz",
      "6821ZZ",
      "NSK 6821ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61821-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6821",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 130,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.8,
    "static_load_kN": 23.9,
    "weight_g": 324,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61821 carries bore code 21 = 105 mm. Outside diameter 130 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 61821-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 105 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6221.",
      "The open 61821-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 105×130×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61821-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61821-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61821 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 105 mm bore 61821 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.8 kN dynamic load rating (C) and 23.9 kN static (C0), 61821 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 324 g, 61821 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×130×13 mm envelope of 61821 gives a D/d ratio of 1.24 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 21.8/23.9 kN load ratings, mass 324 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6821 on the 105×130×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61821 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61821; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61821-NSK bearing?",
        "a": "A 61821-NSK deep-groove ball bearing has a 105 mm bore, 130 mm outer diameter and 13 mm width (4.134 × 5.118 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61821 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61821 uses the same ISO 15 envelope (105×130×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61821-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61821-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61821 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61821?",
        "a": "NSK lists the open 61821 under the bare designation 6821; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 105 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61821 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61821-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61821-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×130×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61821",
      "6821",
      "NSK 6821",
      "61821-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61822-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6822DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 140,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 32.5,
    "weight_g": 497,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61822-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 140 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6822DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 110 mm of 61822-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.",
      "Contact seals add drag and heat: 61822-2RS-NSK runs slower and cooler-limited than the open 61822; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61822-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 61822-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61822-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6822DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 110 mm bore 61822 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 32.5 kN static (C0), 61822 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 497 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 31/32.5 kN load ratings, mass 497 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6822DDU on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61822-2RS-NSK bearing?",
        "a": "A 61822-2RS-NSK deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61822-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61822-2RS-NSK need?",
        "a": "61822-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61822 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61822?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6822DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×140×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61822 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61822-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61822-2RS",
      "61822-2rs",
      "6822DDU",
      "NSK 6822DDU",
      "61822-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61822-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6822VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 140,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 32.5,
    "weight_g": 497,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6822VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 110 mm of 61822-RSR-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.",
      "The low-drag lip of 61822-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61822-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61822-RSR-NSK.",
      "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6822VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 110 mm bore 61822 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 32.5 kN static (C0), 61822 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 497 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 31/32.5 kN load ratings, mass 497 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6822VV on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61822-RSR-NSK bearing?",
        "a": "A 61822-RSR-NSK deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 61822 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61822 uses the same ISO 15 envelope (110×140×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61822-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61822-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61822 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61822?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6822VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×140×16 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6822VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61822-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61822-RSR",
      "61822-rsr",
      "6822VV",
      "NSK 6822VV",
      "61822-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61822-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6822ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 140,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 32.5,
    "weight_g": 497,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6822ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 110 mm bore the ring mass is significant: heat 61822 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 110 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6222.",
      "Do not wash 61822-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61822-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 61822-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6822ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 110 mm bore 61822 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 32.5 kN static (C0), 61822 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 497 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 31/32.5 kN load ratings, mass 497 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6822ZZ on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61822; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61822-ZZ bearing?",
        "a": "A 61822-ZZ deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61822-ZZ need?",
        "a": "61822-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61822 bore code work?",
        "a": "The last two digits of 61822 are bore code 22, giving 22 × 5 = 110 mm bore. The 140 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61822?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6822ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×140×16 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6822ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61822-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61822-ZZ",
      "61822-zz",
      "6822ZZ",
      "NSK 6822ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61822-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6822",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 140,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 31,
    "static_load_kN": 32.5,
    "weight_g": 497,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61822 carries bore code 22 = 110 mm. Outside diameter 140 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 110 mm of 61822-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 110 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6222.",
      "Storage matters for open bearings: 61822-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61822 units.",
      "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61822-NSK drags the lip and overheats it.",
      "The open 61822 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 110 mm bore 61822 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 31 kN dynamic load rating (C) and 32.5 kN static (C0), 61822 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 497 g, 61822 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×140×16 mm envelope of 61822 gives a D/d ratio of 1.27 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 31/32.5 kN load ratings, mass 497 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6822 on the 110×140×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61822 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61822-NSK bearing?",
        "a": "A 61822-NSK deep-groove ball bearing has a 110 mm bore, 140 mm outer diameter and 16 mm width (4.331 × 5.512 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61822 mean?",
        "a": "A bare 61822 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 110 mm bore?",
        "a": "618 is an extra-thin section: 140×16 mm, only 15.0 mm radial section at 110 mm bore, far smaller than a 6222, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61822?",
        "a": "NSK lists the open 61822 under the bare designation 6822; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 110 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61822 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61822-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61822-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×140×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61822",
      "6822",
      "NSK 6822",
      "61822-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61824-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6824DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 150,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 35.5,
    "weight_g": 537,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61824-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6824DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.",
      "Heat is the enemy of the sealed 61824-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61824-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6824DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 120 mm bore 61824 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32 kN dynamic load rating (C) and 35.5 kN static (C0), 61824 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 537 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 32/35.5 kN load ratings, mass 537 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6824DD on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61824; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61824-2RS-NSK bearing?",
        "a": "A 61824-2RS-NSK deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61824-2RS-NSK need?",
        "a": "61824-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61824 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61824 bore code work?",
        "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61824?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6824DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×150×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6824DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61824-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61824-2RS",
      "61824-2rs",
      "6824DD",
      "NSK 6824DD",
      "61824-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61824-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6824VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 150,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 35.5,
    "weight_g": 537,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61824-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6824VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 61824 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 120 mm bore has only a 15.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6224.",
      "RSR low-friction seals on 61824-RSR-NSK run faster than contact-seal 61824-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61824-2RS instead.",
      "The low-drag lip of 61824-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61824-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61824-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6824VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 120 mm bore 61824 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32 kN dynamic load rating (C) and 35.5 kN static (C0), 61824 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 537 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 32/35.5 kN load ratings, mass 537 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6824VV on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61824 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61824-RSR-NSK bearing?",
        "a": "A 61824-RSR-NSK deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 61824 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61824-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61824-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61824?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6824VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×150×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6824VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61824-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61824-RSR",
      "61824-rsr",
      "6824VV",
      "NSK 6824VV",
      "61824-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61824-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6824ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 150,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 35.5,
    "weight_g": 537,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61824-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 150 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6824ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 61824-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.",
      "ZZ shields are non-contact: 61824-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61824-2RS for that.",
      "Do not wash 61824-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61824-C3. No clearance suffix means normal CN clearance.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6824ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 120 mm bore 61824 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32 kN dynamic load rating (C) and 35.5 kN static (C0), 61824 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 537 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 32/35.5 kN load ratings, mass 537 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6824ZZ on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61824-ZZ bearing?",
        "a": "A 61824-ZZ deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61824-ZZ need?",
        "a": "61824-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61824 bore code work?",
        "a": "The last two digits of 61824 are bore code 24, giving 24 × 5 = 120 mm bore. The 150 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61824?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6824ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×150×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61824 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61824-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61824-ZZ",
      "61824-zz",
      "6824ZZ",
      "NSK 6824ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61824-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6824",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 150,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 35.5,
    "weight_g": 537,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61824 carries bore code 24 = 120 mm. Outside diameter 150 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 61824-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 15.0 mm of radial section separates bore and OD on the 618xx series at 120 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6224.",
      "The open 61824-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 120×150×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61824 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61824-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61824 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 120 mm bore 61824 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 32 kN dynamic load rating (C) and 35.5 kN static (C0), 61824 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 537 g, 61824 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 120×150×16 mm envelope of 61824 gives a D/d ratio of 1.25 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 32/35.5 kN load ratings, mass 537 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6824 on the 120×150×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61824 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61824-NSK bearing?",
        "a": "A 61824-NSK deep-groove ball bearing has a 120 mm bore, 150 mm outer diameter and 16 mm width (4.724 × 5.906 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61824 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61824 uses the same ISO 15 envelope (120×150×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61824-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61824-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61824 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61824?",
        "a": "NSK lists the open 61824 under the bare designation 6824; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 120 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6824?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61824-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61824-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×150×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61824",
      "6824",
      "NSK 6824",
      "61824-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61826-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6826DD",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 165,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40.5,
    "static_load_kN": 44,
    "weight_g": 758,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6826DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.",
      "Heat is the enemy of the sealed 61826-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61826-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "The housing bore for the 165 mm OD should be round within IT7; an oval bore pinches the outer ring of 61826-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6826DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 130 mm bore places 61826 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61826 at 40.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 758 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 40.5/44 kN load ratings, mass 758 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6826DD on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61826; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61826-2RS-NSK bearing?",
        "a": "A 61826-2RS-NSK deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61826 bore code work?",
        "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61826-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61826?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6826DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×165×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6826DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61826-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61826-2RS",
      "61826-2rs",
      "6826DD",
      "NSK 6826DD",
      "61826-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61826-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6826VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 165,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40.5,
    "static_load_kN": 44,
    "weight_g": 758,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6826VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 130 mm of 61826-RSR-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.",
      "RSR low-friction seals on 61826-RSR-NSK run faster than contact-seal 61826-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61826-2RS instead.",
      "The low-drag lip of 61826-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 165 mm OD should be round within IT7; an oval bore pinches the outer ring of 61826-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6826VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 130 mm bore places 61826 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61826 at 40.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 758 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 40.5/44 kN load ratings, mass 758 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6826VV on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61826; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61826-RSR-NSK bearing?",
        "a": "A 61826-RSR-NSK deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 61826 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61826 uses the same ISO 15 envelope (130×165×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61826-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61826-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61826 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61826?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6826VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×165×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6826VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61826-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61826-RSR",
      "61826-rsr",
      "6826VV",
      "NSK 6826VV",
      "61826-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61826-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6826ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 165,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40.5,
    "static_load_kN": 44,
    "weight_g": 758,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61826-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 26 by five gives the 130 mm bore; the 165 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 130 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6826ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 130 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6226.",
      "ZZ shields are non-contact: 61826-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61826-2RS for that.",
      "Shielded 61826-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Vibration during standstill brinells the raceways of a 130 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61826-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6826ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 130 mm bore places 61826 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61826 at 40.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 758 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 40.5/44 kN load ratings, mass 758 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6826ZZ on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61826-ZZ bearing?",
        "a": "A 61826-ZZ deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61826-ZZ need?",
        "a": "61826-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61826 bore code work?",
        "a": "The last two digits of 61826 are bore code 26, giving 26 × 5 = 130 mm bore. The 165 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61826?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6826ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×165×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6826ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61826-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61826-ZZ",
      "61826-zz",
      "6826ZZ",
      "NSK 6826ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61826-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6826",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 165,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 40.5,
    "static_load_kN": 44,
    "weight_g": 758,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61826 carries bore code 26 = 130 mm. Outside diameter 165 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass is significant: heat 61826 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 130 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6226.",
      "The open 61826-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 130×165×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61826-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61826-NSK drags the lip and overheats it.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61826-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61826 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 130 mm bore places 61826 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61826 at 40.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 758 g, 61826 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 130×165×18 mm envelope of 61826 gives a D/d ratio of 1.27 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 40.5/44 kN load ratings, mass 758 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6826 on the 130×165×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61826 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61826 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61826-NSK bearing?",
        "a": "A 61826-NSK deep-groove ball bearing has a 130 mm bore, 165 mm outer diameter and 18 mm width (5.118 × 6.496 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 130 mm bore?",
        "a": "618 is an extra-thin section: 165×18 mm, only 17.5 mm radial section at 130 mm bore, far smaller than a 6226, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61826 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61826 uses the same ISO 15 envelope (130×165×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61826?",
        "a": "NSK lists the open 61826 under the bare designation 6826; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6826?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61826-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61826-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×165×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61826",
      "6826",
      "NSK 6826",
      "61826-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61828-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6828DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 175,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 48,
    "weight_g": 832,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61828-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6828DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.",
      "Contact seals add drag and heat: 61828-2RS-NSK runs slower and cooler-limited than the open 61828; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61828-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 175 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61828-2RS-NSK.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6828DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 140 mm bore places 61828 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61828 at 42 kN dynamic (C) and 48 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 832 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 42/48 kN load ratings, mass 832 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6828DDU on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61828-2RS-NSK bearing?",
        "a": "A 61828-2RS-NSK deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61828-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61800 compare with other series at the same 140 mm bore?",
        "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61828?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6828DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×175×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6828DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61828-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61828-2RS",
      "61828-2rs",
      "6828DDU",
      "NSK 6828DDU",
      "61828-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61828-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6828VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 175,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 48,
    "weight_g": 832,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61828-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6828VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 140 mm bore has only a 17.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6228.",
      "RSR low-friction seals on 61828-RSR-NSK run faster than contact-seal 61828-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61828-2RS instead.",
      "The low-drag lip of 61828-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 61828-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6828VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 140 mm bore places 61828 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61828 at 42 kN dynamic (C) and 48 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 832 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 42/48 kN load ratings, mass 832 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6828VV on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61828 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61828-RSR-NSK bearing?",
        "a": "A 61828-RSR-NSK deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 61828 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61828 uses the same ISO 15 envelope (140×175×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61828-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61828-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61828 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61828?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6828VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×175×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6828VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61828-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61828-RSR",
      "61828-rsr",
      "6828VV",
      "NSK 6828VV",
      "61828-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61828-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6828ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 175,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 48,
    "weight_g": 832,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61828-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6828ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 61828 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.",
      "ZZ shields are non-contact: 61828-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61828-2RS for that.",
      "Do not wash 61828-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "The housing bore for the 175 mm OD should be round within IT7; an oval bore pinches the outer ring of 61828-ZZ and shows up later as two-point loaded raceway wear.",
      "Vibration during standstill brinells the raceways of a 140 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6828ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 140 mm bore places 61828 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61828 at 42 kN dynamic (C) and 48 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 832 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 42/48 kN load ratings, mass 832 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6828ZZ on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61828; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61828-ZZ bearing?",
        "a": "A 61828-ZZ deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61800 compare with other series at the same 140 mm bore?",
        "a": "618 is an extra-thin section: 175×18 mm, only 17.5 mm radial section at 140 mm bore, far smaller than a 6228, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "Are 61828 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61828 uses the same ISO 15 envelope (140×175×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61828?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6828ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×175×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61828 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61828-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61828-ZZ",
      "61828-zz",
      "6828ZZ",
      "NSK 6828ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61828-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6828",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 175,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 42,
    "static_load_kN": 48,
    "weight_g": 832,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61828 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 175 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 17.5 mm of radial section separates bore and OD on the 618xx series at 140 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6228.",
      "Storage matters for open bearings: 61828-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61828 units.",
      "Measure the shaft, do not trust the drawing: a 140 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61828-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61828 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 140 mm bore places 61828 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61828 at 42 kN dynamic (C) and 48 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 832 g, 61828 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 140×175×18 mm envelope of 61828 gives a D/d ratio of 1.25 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 42/48 kN load ratings, mass 832 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6828 on the 140×175×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61828 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61828; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61828-NSK bearing?",
        "a": "A 61828-NSK deep-groove ball bearing has a 140 mm bore, 175 mm outer diameter and 18 mm width (5.512 × 6.89 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61828 bore code work?",
        "a": "The last two digits of 61828 are bore code 28, giving 28 × 5 = 140 mm bore. The 175 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61828 mean?",
        "a": "A bare 61828 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61828?",
        "a": "NSK lists the open 61828 under the bare designation 6828; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6828 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61828-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61828-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×175×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61828",
      "6828",
      "NSK 6828",
      "61828-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61830-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6830DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 58.5,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61830-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6830DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 150 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6230.",
      "Contact seals add drag and heat: 61830-2RS runs slower and cooler-limited than the open 61830; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61830-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6830DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 150 mm bore places 61830 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61830 at 52.5 kN dynamic (C) and 58.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1150 g (1.1 kg), 61830 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 52.5/58.5 kN load ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830DDU on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61830-2RS bearing?",
        "a": "A 61830-2RS deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61830-2RS be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61830-2RS need?",
        "a": "61830-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61830 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61830?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6830DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×190×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6830DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61830-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61830-2RS",
      "61830-2rs",
      "6830DDU",
      "NSK 6830DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61830-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6830VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 58.5,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6830VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 150 mm of 61830-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.",
      "RSR low-friction seals on 61830-RSR run faster than contact-seal 61830-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61830-2RS instead.",
      "The low-drag lip of 61830-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6830VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 150 mm bore places 61830 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61830 at 52.5 kN dynamic (C) and 58.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1150 g (1.1 kg), 61830 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 52.5/58.5 kN load ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830VV on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61830; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61830-RSR bearing?",
        "a": "A 61830-RSR deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61830-RSR need?",
        "a": "61830-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61830 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61830 bore code work?",
        "a": "The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61830?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6830VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×190×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6830VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61830-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61830-RSR",
      "61830-rsr",
      "6830VV",
      "NSK 6830VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61830-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6830ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 58.5,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6830ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 61830 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 150 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6230.",
      "ZZ shields are non-contact: 61830-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61830-2RS for that.",
      "Do not wash 61830-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61830-ZZ.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6830ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 150 mm bore places 61830 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61830 at 52.5 kN dynamic (C) and 58.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1150 g (1.1 kg), 61830 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 52.5/58.5 kN load ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830ZZ on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61830 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61830-ZZ bearing?",
        "a": "A 61830-ZZ deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61830-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61800 compare with other series at the same 150 mm bore?",
        "a": "618 is an extra-thin section: 190×20 mm, only 20.0 mm radial section at 150 mm bore, far smaller than a 6230, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61830?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6830ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×190×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6830ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61830-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61830-ZZ",
      "61830-zz",
      "6830ZZ",
      "NSK 6830ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61830-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6830",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 52.5,
    "static_load_kN": 58.5,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61830 carries bore code 30 = 150 mm. Outside diameter 190 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 150 mm of 61830-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 150 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6230.",
      "The open 61830-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61830 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61830-NSK drags the lip and overheats it.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61830 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 150 mm bore places 61830 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61830 at 52.5 kN dynamic (C) and 58.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1150 g (1.1 kg), 61830 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×190×20 mm envelope of 61830 gives a D/d ratio of 1.27 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 52.5/58.5 kN load ratings, mass 1150 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6830 on the 150×190×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61830 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61830-NSK bearing?",
        "a": "A 61830-NSK deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61830-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61830-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61830 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61830-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 61830?",
        "a": "NSK lists the open 61830 under the bare designation 6830; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6830 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61830-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61830-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×190×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61830",
      "6830",
      "NSK 6830",
      "61830-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61832-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6832DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 53,
    "static_load_kN": 61,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6832DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 160 mm of 61832-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.",
      "Contact seals add drag and heat: 61832-2RS runs slower and cooler-limited than the open 61832; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61832-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61832-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6832DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 160 mm bore places 61832 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61832 at 53 kN dynamic (C) and 61 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 53/61 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832DDU on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61832-2RS bearing?",
        "a": "A 61832-2RS deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61832 bore code work?",
        "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61832-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61832?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6832DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×200×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6832DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61832-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61832-2RS",
      "61832-2rs",
      "6832DDU",
      "NSK 6832DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61832-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6832VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 53,
    "static_load_kN": 61,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61832-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 200 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6832VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.",
      "The low-drag lip of 61832-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61832-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 160 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61832-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6832VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 160 mm bore places 61832 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61832 at 53 kN dynamic (C) and 61 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 53/61 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832VV on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61832-RSR bearing?",
        "a": "A 61832-RSR deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61832 bore code work?",
        "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61832-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61832?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6832VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×200×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6832VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61832-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61832-RSR",
      "61832-rsr",
      "6832VV",
      "NSK 6832VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61832-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6832ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 53,
    "static_load_kN": 61,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61832 carries bore code 32 = 160 mm. Outside diameter 200 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6832ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 61832 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 20.0 mm of radial section separates bore and OD on the 618xx series at 160 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6232.",
      "ZZ shields are non-contact: 61832-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61832-2RS for that.",
      "Shielded 61832-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 61832-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6832ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 160 mm bore places 61832 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61832 at 53 kN dynamic (C) and 61 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 53/61 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832ZZ on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61832; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61832-ZZ bearing?",
        "a": "A 61832-ZZ deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61832 bore code work?",
        "a": "The last two digits of 61832 are bore code 32, giving 32 × 5 = 160 mm bore. The 200 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61832-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61832?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6832ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×200×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6832ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61832-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61832-ZZ",
      "61832-zz",
      "6832ZZ",
      "NSK 6832ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61832-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6832",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 53,
    "static_load_kN": 61,
    "weight_g": 1230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61832 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 200 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 160 mm of 61832-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 160 mm bore has only a 20.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6232.",
      "The open 61832-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 160×200×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61832-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 61832-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61832 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 160 mm bore places 61832 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61832 at 53 kN dynamic (C) and 61 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1230 g (1.2 kg), 61832 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×200×20 mm envelope of 61832 gives a D/d ratio of 1.25 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 53/61 kN load ratings, mass 1230 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6832 on the 160×200×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61832 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61832-NSK bearing?",
        "a": "A 61832-NSK deep-groove ball bearing has a 160 mm bore, 200 mm outer diameter and 20 mm width (6.299 × 7.874 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61832 mean?",
        "a": "A bare 61832 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 160 mm bore?",
        "a": "618 is an extra-thin section: 200×20 mm, only 20.0 mm radial section at 160 mm bore, far smaller than a 6232, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61832?",
        "a": "NSK lists the open 61832 under the bare designation 6832; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6832 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61832-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61832",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×200×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61832",
      "6832",
      "NSK 6832",
      "61832-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61834-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6834DDU",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 75,
    "weight_g": 1860,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61834-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6834DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.",
      "Heat is the enemy of the sealed 61834-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61834-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61834-2RS.",
      "NSK catalogues the contact-sealed version as 6834DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 170 mm bore places 61834 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61834 at 66 kN dynamic (C) and 75 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1860 g (1.9 kg), 61834 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 66/75 kN load ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834DDU on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61834 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61834-2RS bearing?",
        "a": "A 61834-2RS deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61834 bore code work?",
        "a": "The last two digits of 61834 are bore code 34, giving 34 × 5 = 170 mm bore. The 215 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61834-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61834?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6834DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×215×22 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6834DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61834-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61834-2RS",
      "61834-2rs",
      "6834DDU",
      "NSK 6834DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61834-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6834VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 75,
    "weight_g": 1860,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61834-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6834VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass is significant: heat 61834 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "Only 22.5 mm of radial section separates bore and OD on the 618xx series at 170 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6234.",
      "The low-drag lip of 61834-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61834-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 170 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61834-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6834VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 170 mm bore places 61834 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61834 at 66 kN dynamic (C) and 75 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1860 g (1.9 kg), 61834 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 66/75 kN load ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834VV on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61834; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61834-RSR bearing?",
        "a": "A 61834-RSR deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61834-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 61834-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61834-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61834?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6834VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×215×22 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6834VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61834-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61834-RSR",
      "61834-rsr",
      "6834VV",
      "NSK 6834VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61834-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6834ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 75,
    "weight_g": 1860,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61834 carries bore code 34 = 170 mm. Outside diameter 215 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6834ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 22.5 mm of radial section separates bore and OD on the 618xx series at 170 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6234.",
      "ZZ shields are non-contact: 61834-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61834-2RS for that.",
      "Do not wash 61834-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 61834-ZZ drags the lip and overheats it.",
      "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6834ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 170 mm bore places 61834 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61834 at 66 kN dynamic (C) and 75 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1860 g (1.9 kg), 61834 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 66/75 kN load ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834ZZ on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61834-ZZ bearing?",
        "a": "A 61834-ZZ deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61834 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61834 uses the same ISO 15 envelope (170×215×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61834-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61834-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61834 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61834?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6834ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×215×22 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6834ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61834-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61834-ZZ",
      "61834-zz",
      "6834ZZ",
      "NSK 6834ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61834-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6834",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66,
    "static_load_kN": 75,
    "weight_g": 1860,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61834 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 215 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 61834-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 618xx thin section at 170 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6234.",
      "The open 61834-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 170×215×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61834 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61834-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61834 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 170 mm bore places 61834 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61834 at 66 kN dynamic (C) and 75 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1860 g (1.9 kg), 61834 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 170×215×22 mm envelope of 61834 gives a D/d ratio of 1.26 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 66/75 kN load ratings, mass 1860 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6834 on the 170×215×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61834 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61834 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61834; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61834-NSK bearing?",
        "a": "A 61834-NSK deep-groove ball bearing has a 170 mm bore, 215 mm outer diameter and 22 mm width (6.693 × 8.465 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61834 mean?",
        "a": "A bare 61834 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 170 mm bore?",
        "a": "618 is an extra-thin section: 215×22 mm, only 22.5 mm radial section at 170 mm bore, far smaller than a 6234, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61834?",
        "a": "NSK lists the open 61834 under the bare designation 6834; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6834 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61834-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61834",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×215×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61834",
      "6834",
      "NSK 6834",
      "61834-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61836-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6836VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 225,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66.5,
    "static_load_kN": 78.5,
    "weight_g": 1980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6836VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "Only 22.5 mm of radial section separates bore and OD on the 618xx series at 180 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6236.",
      "RSR low-friction seals on 61836-RSR run faster than contact-seal 61836-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61836-2RS instead.",
      "The low-drag lip of 61836-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 61836-RSR and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6836VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 180 mm bore places 61836 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61836 at 66.5 kN dynamic (C) and 78.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1980 g (2.0 kg), 61836 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 180×225×22 mm envelope of 61836 gives a D/d ratio of 1.25 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 66.5/78.5 kN load ratings, mass 1980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6836VV on the 180×225×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61836 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61836-RSR bearing?",
        "a": "A 61836-RSR deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61836-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61800 compare with other series at the same 180 mm bore?",
        "a": "618 is an extra-thin section: 225×22 mm, only 22.5 mm radial section at 180 mm bore, far smaller than a 6236, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61836?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6836VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 180×225×22 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6836VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61836-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61836-RSR",
      "61836-rsr",
      "6836VV",
      "NSK 6836VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61836-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6836",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 225,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 66.5,
    "static_load_kN": 78.5,
    "weight_g": 1980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61836 carries bore code 36 = 180 mm. Outside diameter 225 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass is significant: heat 61836 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 180 mm bore has only a 22.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6236.",
      "The open 61836-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 180×225×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61836 units.",
      "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61836 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 180 mm bore places 61836 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61836 at 66.5 kN dynamic (C) and 78.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1980 g (2.0 kg), 61836 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 180×225×22 mm envelope of 61836 gives a D/d ratio of 1.25 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 66.5/78.5 kN load ratings, mass 1980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6836 on the 180×225×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61836 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61836; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61836-NSK bearing?",
        "a": "A 61836-NSK deep-groove ball bearing has a 180 mm bore, 225 mm outer diameter and 22 mm width (7.087 × 8.858 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61836 bore code work?",
        "a": "The last two digits of 61836 are bore code 36, giving 36 × 5 = 180 mm bore. The 225 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61836 mean?",
        "a": "A bare 61836 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61836?",
        "a": "NSK lists the open 61836 under the bare designation 6836; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6836?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61836-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61836",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×225×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61836",
      "6836",
      "NSK 6836",
      "61836-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61838-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6838VV",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 240,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80.5,
    "static_load_kN": 93.5,
    "weight_g": 2530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61838 carries bore code 38 = 190 mm. Outside diameter 240 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6838VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 190 mm of 61838-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 190 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6238.",
      "RSR low-friction seals on 61838-RSR run faster than contact-seal 61838-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61838-2RS instead.",
      "The low-drag lip of 61838-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Vibration during standstill brinells the raceways of a 190 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6838VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 190 mm bore places 61838 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 80.5 kN dynamic load rating (C) and 93.5 kN static (C0), 61838 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2530 g (2.5 kg), 61838 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 190×240×24 mm envelope of 61838 gives a D/d ratio of 1.26 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 80.5/93.5 kN load ratings, mass 2530 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6838VV on the 190×240×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61838 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61838 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61838-RSR bearing?",
        "a": "A 61838-RSR deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61838-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61800 compare with other series at the same 190 mm bore?",
        "a": "618 is an extra-thin section: 240×24 mm, only 25.0 mm radial section at 190 mm bore, far smaller than a 6238, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61838?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6838VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 190×240×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61838 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61838-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61838-RSR",
      "61838-rsr",
      "6838VV",
      "NSK 6838VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61838-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6838",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 240,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80.5,
    "static_load_kN": 93.5,
    "weight_g": 2530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61838 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 240 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 190 mm of 61838-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 190 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6238.",
      "Storage matters for open bearings: 61838-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61838 units.",
      "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61838-NSK.",
      "The open 61838 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 190 mm bore places 61838 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 80.5 kN dynamic load rating (C) and 93.5 kN static (C0), 61838 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2530 g (2.5 kg), 61838 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 190×240×24 mm envelope of 61838 gives a D/d ratio of 1.26 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 80.5/93.5 kN load ratings, mass 2530 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6838 on the 190×240×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61838 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61838-NSK bearing?",
        "a": "A 61838-NSK deep-groove ball bearing has a 190 mm bore, 240 mm outer diameter and 24 mm width (7.48 × 9.449 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61838-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61838-NSK need?",
        "a": "The open 61838-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61838?",
        "a": "NSK lists the open 61838 under the bare designation 6838; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6838?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61838-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61838",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×240×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61838",
      "6838",
      "NSK 6838",
      "61838-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61840-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6840",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 250,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 81.5,
    "static_load_kN": 98,
    "weight_g": 2670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61840 carries bore code 40 = 200 mm. Outside diameter 250 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 200 mm of 61840-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "Only 25.0 mm of radial section separates bore and OD on the 618xx series at 200 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6240.",
      "Storage matters for open bearings: 61840-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61840 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 61840 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 200 mm bore places 61840 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 81.5 kN dynamic load rating (C) and 98 kN static (C0), 61840 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2670 g (2.7 kg), 61840 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 200×250×24 mm envelope of 61840 gives a D/d ratio of 1.25 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 81.5/98 kN load ratings, mass 2670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6840 on the 200×250×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61840 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61840-NSK bearing?",
        "a": "A 61840-NSK deep-groove ball bearing has a 200 mm bore, 250 mm outer diameter and 24 mm width (7.874 × 9.843 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61840 mean?",
        "a": "A bare 61840 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61800 compare with other series at the same 200 mm bore?",
        "a": "618 is an extra-thin section: 250×24 mm, only 25.0 mm radial section at 200 mm bore, far smaller than a 6240, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK order number for an open 61840?",
        "a": "NSK lists the open 61840 under the bare designation 6840; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6840 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61840-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61840-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61840",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×250×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61840",
      "6840",
      "NSK 6840",
      "61840-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61844-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6844ZZ",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 270,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 84,
    "static_load_kN": 107,
    "weight_g": 2900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61844 carries bore code 44 = 220 mm. Outside diameter 270 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6844ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.",
      "ZZ shields are non-contact: 61844-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61844-2RS for that.",
      "Shielded 61844-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 61844-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The housing bore for the 270 mm OD should be round within IT7; an oval bore pinches the outer ring of 61844-ZZ and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6844ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 220 mm bore places 61844 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "At 84 kN dynamic load rating (C) and 107 kN static (C0), 61844 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2900 g (2.9 kg), 61844 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 220×270×24 mm envelope of 61844 gives a D/d ratio of 1.23 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 84/107 kN load ratings, mass 2900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6844ZZ on the 220×270×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61844 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61844-ZZ bearing?",
        "a": "A 61844-ZZ deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61844-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61800 compare with other series at the same 220 mm bore?",
        "a": "618 is an extra-thin section: 270×24 mm, only 25.0 mm radial section at 220 mm bore, far smaller than a 6244, for space-limited layouts at the cost of load rating and misalignment tolerance."
      },
      {
        "q": "What is the NSK suffix for a sealed 61844?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6844ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 220×270×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61844 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61844-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61844-ZZ",
      "61844-zz",
      "6844ZZ",
      "NSK 6844ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61844-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6844",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 270,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 84,
    "static_load_kN": 107,
    "weight_g": 2900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61844 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 270 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 618xx thin section at 220 mm bore has only a 25.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6244.",
      "The open 61844-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 220×270×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61844 units.",
      "Measure the shaft, do not trust the drawing: a 220 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61844-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61844-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61844 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 220 mm bore places 61844 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "At 84 kN dynamic load rating (C) and 107 kN static (C0), 61844 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2900 g (2.9 kg), 61844 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 220×270×24 mm envelope of 61844 gives a D/d ratio of 1.23 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 84/107 kN load ratings, mass 2900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6844 on the 220×270×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61844 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61844-NSK bearing?",
        "a": "A 61844-NSK deep-groove ball bearing has a 220 mm bore, 270 mm outer diameter and 24 mm width (8.661 × 10.63 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61844-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 220 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61844-NSK need?",
        "a": "The open 61844-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61844?",
        "a": "NSK lists the open 61844 under the bare designation 6844; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6844?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61844-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61844",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×270×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61844",
      "6844",
      "NSK 6844",
      "61844-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61848-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6848",
    "series": "61800-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 300,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 108,
    "static_load_kN": 137,
    "weight_g": 4480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61848 carries bore code 48 = 240 mm. Outside diameter 300 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass is significant: heat 61848 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 618xx thin section at 240 mm bore has only a 30.0 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6248.",
      "Storage matters for open bearings: 61848-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61848 units.",
      "Vibration during standstill brinells the raceways of a 240 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61848 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 240 mm bore places 61848 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "At 108 kN dynamic load rating (C) and 137 kN static (C0), 61848 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4480 g (4.5 kg), 61848 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 240×300×28 mm envelope of 61848 gives a D/d ratio of 1.25 and only 30.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 108/137 kN load ratings, mass 4480 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6848 on the 240×300×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61848 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61848-NSK bearing?",
        "a": "A 61848-NSK deep-groove ball bearing has a 240 mm bore, 300 mm outer diameter and 28 mm width (9.449 × 11.811 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61848-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61848-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61848 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61848-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 61848?",
        "a": "NSK lists the open 61848 under the bare designation 6848; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6848 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61848-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61848-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61848",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×300×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61848",
      "6848",
      "NSK 6848",
      "61848-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61900-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6900DD",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 22,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.97,
    "static_load_kN": 1.27,
    "weight_g": 9,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61900-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6900DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61900 with C3 for those conditions.",
      "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61900-2RS-NSK runs slower and cooler-limited than the open 61900; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61900-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6900DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 10 mm bore the 61900 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.97 kN dynamic load rating (C) and 1.27 kN static (C0), 61900 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 9 g, 61900 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 2.97/1.27 kN load ratings, mass 9 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6900DD on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61900 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61900-2RS-NSK bearing?",
        "a": "A 61900-2RS-NSK deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61900-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61900-2RS-NSK need?",
        "a": "61900-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61900 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61900?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6900DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×22×6 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6900DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61900-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61900-2RS",
      "61900-2rs",
      "6900DD",
      "NSK 6900DD",
      "61900-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61900-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6900VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 22,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.97,
    "static_load_kN": 1.27,
    "weight_g": 9,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61900 carries bore code 10 = 10 mm. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6900VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61900 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section at 10 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61900-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61900-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.",
      "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The housing bore for the 22 mm OD should be round within IT7; an oval bore pinches the outer ring of 61900-RSR and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6900VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 10 mm bore the 61900 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.97 kN dynamic load rating (C) and 1.27 kN static (C0), 61900 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 9 g, 61900 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 2.97/1.27 kN load ratings, mass 9 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6900VV on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61900-RSR bearing?",
        "a": "A 61900-RSR deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61900-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61900 compare with other series at the same 10 mm bore?",
        "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6210 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61900?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6900VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×22×6 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6900VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61900-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61900-RSR",
      "61900-rsr",
      "6900VV",
      "NSK 6900VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61900-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6900ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 22,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.97,
    "static_load_kN": 1.27,
    "weight_g": 9,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61900-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6900ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61900 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61900-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61900-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61900-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61900-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6900ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 10 mm bore the 61900 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.97 kN dynamic load rating (C) and 1.27 kN static (C0), 61900 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 9 g, 61900 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 2.97/1.27 kN load ratings, mass 9 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6900ZZ on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61900-ZZ-NSK bearing?",
        "a": "A 61900-ZZ-NSK deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61900-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61900-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61900-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61900?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6900ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×22×6 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6900ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61900-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61900-ZZ",
      "61900-zz",
      "6900ZZ",
      "NSK 6900ZZ",
      "61900-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61900-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6900",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 22,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2.97,
    "static_load_kN": 1.27,
    "weight_g": 9,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61900 carries bore code 10 = 10 mm. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61900 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section at 10 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61900-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 10×22×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61900-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61900-NSK drags the lip and overheats it.",
      "The open 61900 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 10 mm bore the 61900 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 2.97 kN dynamic load rating (C) and 1.27 kN static (C0), 61900 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 9 g, 61900 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 2.97/1.27 kN load ratings, mass 9 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6900 on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61900-NSK bearing?",
        "a": "A 61900-NSK deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 10 mm bore?",
        "a": "619 is a thin section one step above 618: 22×6 mm with a 6.0 mm radial section at 10 mm bore; a 6210 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61900 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61900 uses the same ISO 15 envelope (10×22×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61900?",
        "a": "NSK lists the open 61900 under the bare designation 6900; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 10 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61900 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61900-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61900",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61900",
      "6900",
      "NSK 6900",
      "61900-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61901-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6901DD",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 24,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3.2,
    "static_load_kN": 1.46,
    "weight_g": 10,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61901-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6901DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61901 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61901-2RS-NSK runs slower and cooler-limited than the open 61901; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61901-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61901-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6901DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 12 mm bore the 61901 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 3.2 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 10 g, 61901 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 3.2/1.46 kN load ratings, mass 10 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6901DD on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61901; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61901-2RS-NSK bearing?",
        "a": "A 61901-2RS-NSK deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61901-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61901-2RS-NSK need?",
        "a": "61901-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61901 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61901?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6901DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×24×6 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61901 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61901-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61901-2RS",
      "61901-2rs",
      "6901DD",
      "NSK 6901DD",
      "61901-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61901-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6901VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 24,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3.2,
    "static_load_kN": 1.46,
    "weight_g": 10,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61901 carries bore code 12 = 12 mm. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6901VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61901 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61901-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61901-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-RSR.",
      "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61901-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6901VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 12 mm bore the 61901 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 3.2 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 10 g, 61901 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 3.2/1.46 kN load ratings, mass 10 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6901VV on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61901; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61901-RSR bearing?",
        "a": "A 61901-RSR deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61901-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61900 compare with other series at the same 12 mm bore?",
        "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6212 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61901?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6901VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×24×6 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6901VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61901-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61901-RSR",
      "61901-rsr",
      "6901VV",
      "NSK 6901VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61901-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6901ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 24,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3.2,
    "static_load_kN": 1.46,
    "weight_g": 10,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61901 carries bore code 12 = 12 mm. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6901ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61901 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61901-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61901-2RS for that.",
      "Do not wash 61901-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6901ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 12 mm bore the 61901 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 3.2 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 10 g, 61901 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 3.2/1.46 kN load ratings, mass 10 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6901ZZ on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61901; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61901 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61901-ZZ-NSK bearing?",
        "a": "A 61901-ZZ-NSK deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 12 mm bore?",
        "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6212 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61901 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61901 uses the same ISO 15 envelope (12×24×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61901?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6901ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×24×6 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6901ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61901-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61901-ZZ",
      "61901-zz",
      "6901ZZ",
      "NSK 6901ZZ",
      "61901-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61901-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6901",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 24,
    "B_mm": 6,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 3.2,
    "static_load_kN": 1.46,
    "weight_g": 10,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61901 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61901 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61901-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 12×24×6 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61901 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 24 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61901-NSK.",
      "The open 61901 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 12 mm bore the 61901 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 3.2 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 10 g, 61901 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 3.2/1.46 kN load ratings, mass 10 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6901 on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61901; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61901-NSK bearing?",
        "a": "A 61901-NSK deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 61901-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61901-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61901 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61901-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 61901?",
        "a": "NSK lists the open 61901 under the bare designation 6901; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 12 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6901?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61901-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61901",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61901",
      "6901",
      "NSK 6901",
      "61901-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61902-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6902DD",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 28,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.75,
    "static_load_kN": 2.26,
    "weight_g": 15,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 15 = 15 mm. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6902DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61902 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61902-2RS-NSK runs slower and cooler-limited than the open 61902; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61902-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 28 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61902-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6902DD (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 15 mm bore the 61902 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 4.75 kN dynamic load rating (C) and 2.26 kN static (C0), 61902 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 15 g, 61902 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 4.75/2.26 kN load ratings, mass 15 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6902DD on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61902; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61902-2RS-NSK bearing?",
        "a": "A 61902-2RS-NSK deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61902 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61902-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61902-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61902?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6902DD), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×28×7 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6902DD?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61902-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61902-2RS",
      "61902-2rs",
      "6902DD",
      "NSK 6902DD",
      "61902-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61902-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6902VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 28,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.75,
    "static_load_kN": 2.26,
    "weight_g": 15,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 15 = 15 mm. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6902VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61902 with C3 for those conditions.",
      "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The low-drag lip of 61902-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61902-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 28 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61902-RSR-NSK.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6902VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 15 mm bore the 61902 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 4.75 kN dynamic load rating (C) and 2.26 kN static (C0), 61902 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 15 g, 61902 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 4.75/2.26 kN load ratings, mass 15 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6902VV on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61902; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61902-RSR-NSK bearing?",
        "a": "A 61902-RSR-NSK deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61902 bore code work?",
        "a": "The last two digits of 61902 are bore code 15, giving 15 × 5 = 15 mm bore. The 28 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61902-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61902?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6902VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×28×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61902 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61902-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61902-RSR",
      "61902-rsr",
      "6902VV",
      "NSK 6902VV",
      "61902-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61902-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6902ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 28,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.75,
    "static_load_kN": 2.26,
    "weight_g": 15,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 15 = 15 mm. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6902ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61902 with C3 for those conditions.",
      "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Do not wash 61902-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61902-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6902ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 15 mm bore the 61902 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 4.75 kN dynamic load rating (C) and 2.26 kN static (C0), 61902 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 15 g, 61902 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 4.75/2.26 kN load ratings, mass 15 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6902ZZ on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61902; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61902-ZZ-NSK bearing?",
        "a": "A 61902-ZZ-NSK deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61902-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61902-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61902-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61902?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6902ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×28×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61902 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61902-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61902-ZZ",
      "61902-zz",
      "6902ZZ",
      "NSK 6902ZZ",
      "61902-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61902-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6902",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 28,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 4.75,
    "static_load_kN": 2.26,
    "weight_g": 15,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 15 = 15 mm. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61902 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section (6.5 mm section height at 15 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61902-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 15×28×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61902 units.",
      "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61902-NSK.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61902 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 15 mm bore the 61902 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 4.75 kN dynamic load rating (C) and 2.26 kN static (C0), 61902 is a light-load NSK bearing: the L10 life at catalogue C is short above a few kN of equivalent load, so size up to a 62-series on the same bore if the application sees shock or frequent starts.",
      "At only 15 g, 61902 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 4.75/2.26 kN load ratings, mass 15 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6902 on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61902; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61902-NSK bearing?",
        "a": "A 61902-NSK deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 15 mm bore?",
        "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6215 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61902 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61902?",
        "a": "NSK lists the open 61902 under the bare designation 6902; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 15 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61902 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61902-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61902",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61902",
      "6902",
      "NSK 6902",
      "61902-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61903-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6903DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 30,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 2.55,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61903-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6903DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 17 mm bore the ring mass is significant: heat 61903 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 17 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Heat is the enemy of the sealed 61903-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61903-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61903-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6903DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 17 mm bore the 61903 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 61903 at 5.05 kN dynamic (C) and 2.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 17 g, 61903 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 5.05/2.55 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6903DDU on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61903 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61903-2RS-NSK bearing?",
        "a": "A 61903-2RS-NSK deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61903-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61903-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61903 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61903-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61903?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6903DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×30×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6903DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61903-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61903-2RS",
      "61903-2rs",
      "6903DDU",
      "NSK 6903DDU",
      "61903-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61903-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6903VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 30,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 2.55,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61903-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6903VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "RSR low-friction seals on 61903-RSR-NSK run faster than contact-seal 61903-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61903-2RS instead.",
      "The low-drag lip of 61903-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61903-RSR-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6903VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 17 mm bore the 61903 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 61903 at 5.05 kN dynamic (C) and 2.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 17 g, 61903 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 5.05/2.55 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6903VV on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61903-RSR-NSK bearing?",
        "a": "A 61903-RSR-NSK deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61903-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61903-RSR-NSK need?",
        "a": "61903-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61903 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61903?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6903VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×30×7 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6903VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61903-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61903-RSR",
      "61903-rsr",
      "6903VV",
      "NSK 6903VV",
      "61903-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61903-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6903ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 30,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 2.55,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61903-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6903ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 61903-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61903-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61903-2RS for that.",
      "Do not wash 61903-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Never mix components between two 61903-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6903ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 17 mm bore the 61903 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 61903 at 5.05 kN dynamic (C) and 2.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 17 g, 61903 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 5.05/2.55 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6903ZZ on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61903; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61903-ZZ-NSK bearing?",
        "a": "A 61903-ZZ-NSK deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 17 mm bore?",
        "a": "619 is a thin section one step above 618: 30×7 mm with a 6.5 mm radial section at 17 mm bore; a 6217 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61903 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61903 uses the same ISO 15 envelope (17×30×7 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61903?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6903ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×30×7 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61903 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61903-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61903-ZZ",
      "61903-zz",
      "6903ZZ",
      "NSK 6903ZZ",
      "61903-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61903-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6903",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 30,
    "B_mm": 7,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 2.55,
    "weight_g": 17,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61903 carries bore code 17 = 17 mm. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 17 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61903-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 17×30×7 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61903-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The housing bore for the 30 mm OD should be round within IT7; an oval bore pinches the outer ring of 61903-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61903 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 17 mm bore the 61903 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 61903 at 5.05 kN dynamic (C) and 2.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 17 g, 61903 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 5.05/2.55 kN load ratings, mass 17 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6903 on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61903-NSK bearing?",
        "a": "A 61903-NSK deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61903 bore code work?",
        "a": "The last two digits of 61903 are bore code 17, giving 17 × 5 = 17 mm bore. The 30 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61903 mean?",
        "a": "A bare 61903 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61903?",
        "a": "NSK lists the open 61903 under the bare designation 6903; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 17 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6903?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61903-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61903",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61903",
      "6903",
      "NSK 6903",
      "61903-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6904DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 3.7,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61904-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6904DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61904-2RS-NSK.",
      "The 619xx thin section at 20 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61904-2RS-NSK runs slower and cooler-limited than the open 61904; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61904-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6904DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 20 mm bore puts 61904 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61904 at 7 kN dynamic (C) and 3.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 61904 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 7/3.7 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6904DDU on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61904 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-2RS-NSK bearing?",
        "a": "A 61904-2RS-NSK deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61904 bore code work?",
        "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61904-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61904?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6904DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×37×9 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6904DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904-2RS",
      "61904-2rs",
      "6904DDU",
      "NSK 6904DDU",
      "61904-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6904VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 3.7,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61904-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6904VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61904-RSR-NSK.",
      "The 619xx thin section at 20 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61904-RSR-NSK run faster than contact-seal 61904-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61904-2RS instead.",
      "The low-drag lip of 61904-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 37 mm OD should be round within IT7; an oval bore pinches the outer ring of 61904-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6904VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 20 mm bore puts 61904 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61904 at 7 kN dynamic (C) and 3.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 61904 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 7/3.7 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6904VV on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61904; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-RSR-NSK bearing?",
        "a": "A 61904-RSR-NSK deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61904-RSR-NSK need?",
        "a": "61904-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61904 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61904 bore code work?",
        "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61904?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6904VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×37×9 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6904VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904-RSR",
      "61904-rsr",
      "6904VV",
      "NSK 6904VV",
      "61904-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6904ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 3.7,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61904-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 37 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6904ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-ZZ; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section (8.5 mm section height at 20 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61904-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61904-2RS for that.",
      "Do not wash 61904-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6904ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 20 mm bore puts 61904 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61904 at 7 kN dynamic (C) and 3.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 61904 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 7/3.7 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6904ZZ on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61904; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-ZZ bearing?",
        "a": "A 61904-ZZ deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61904 bore code work?",
        "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61904-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61904?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6904ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×37×9 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6904ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904-ZZ",
      "61904-zz",
      "6904ZZ",
      "NSK 6904ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61904-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6904",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 37,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7,
    "static_load_kN": 3.7,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61904-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section at 20 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61904-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61904 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The housing bore for the 37 mm OD should be round within IT7; an oval bore pinches the outer ring of 61904-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61904 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 20 mm bore puts 61904 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61904 at 7 kN dynamic (C) and 3.7 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 61904 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 20×37×9 mm envelope of 61904 gives a D/d ratio of 1.85 and 8.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 7/3.7 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6904 on the 20×37×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61904 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61904-NSK bearing?",
        "a": "A 61904-NSK deep-groove ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61904 bore code work?",
        "a": "The last two digits of 61904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61904 mean?",
        "a": "A bare 61904 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61904?",
        "a": "NSK lists the open 61904 under the bare designation 6904; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6904?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61904-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61904-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61904",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×37×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61904",
      "6904",
      "NSK 6904",
      "61904-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6905DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.75,
    "static_load_kN": 4.55,
    "weight_g": 42,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61905-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 42 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6905DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 25 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61905-2RS-NSK.",
      "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Heat is the enemy of the sealed 61905-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61905-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6905DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 25 mm bore puts 61905 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61905 at 7.75 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 42 g, 61905 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.75/4.55 kN load ratings, mass 42 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6905DDU on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61905; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-2RS-NSK bearing?",
        "a": "A 61905-2RS-NSK deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61905-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61905-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61905-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61905?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6905DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×42×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6905DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905-2RS",
      "61905-2rs",
      "6905DDU",
      "NSK 6905DDU",
      "61905-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6905VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.75,
    "static_load_kN": 4.55,
    "weight_g": 42,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61905-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 42 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6905VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "RSR low-friction seals on 61905-RSR-NSK run faster than contact-seal 61905-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61905-2RS instead.",
      "The non-contact lip of 61905-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6905VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 25 mm bore puts 61905 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61905 at 7.75 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 42 g, 61905 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.75/4.55 kN load ratings, mass 42 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6905VV on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-RSR-NSK bearing?",
        "a": "A 61905-RSR-NSK deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61905 bore code work?",
        "a": "The last two digits of 61905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61905-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61905?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6905VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×42×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6905VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905-RSR",
      "61905-rsr",
      "6905VV",
      "NSK 6905VV",
      "61905-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6905ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.75,
    "static_load_kN": 4.55,
    "weight_g": 42,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6905ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 25 mm shaft for 61905 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section at 25 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61905-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61905-2RS for that.",
      "Shielded 61905-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61905-ZZ.",
      "NSK catalogues the shielded version as 6905ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 25 mm bore puts 61905 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61905 at 7.75 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 42 g, 61905 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.75/4.55 kN load ratings, mass 42 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6905ZZ on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-ZZ bearing?",
        "a": "A 61905-ZZ deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61905-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61905-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61905-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61905?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6905ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×42×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6905ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905-ZZ",
      "61905-zz",
      "6905ZZ",
      "NSK 6905ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61905-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6905",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 42,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.75,
    "static_load_kN": 4.55,
    "weight_g": 42,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61905 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 42 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61905-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section (8.5 mm section height at 25 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61905-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 25×42×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61905-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61905-NSK.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 61905 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 25 mm bore puts 61905 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61905 at 7.75 kN dynamic (C) and 4.55 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 42 g, 61905 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 25×42×9 mm envelope of 61905 gives a D/d ratio of 1.68 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.75/4.55 kN load ratings, mass 42 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6905 on the 25×42×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61905 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61905 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61905-NSK bearing?",
        "a": "A 61905-NSK deep-groove ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61905 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61905 uses the same ISO 15 envelope (25×42×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61905-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61905-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61905 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61905?",
        "a": "NSK lists the open 61905 under the bare designation 6905; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61905 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61905-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61905-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61905-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×42×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61905",
      "6905",
      "NSK 6905",
      "61905-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6906DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.95,
    "static_load_kN": 5,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61906-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6906DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61906-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61906-2RS-NSK runs slower and cooler-limited than the open 61906; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61906-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61906-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 61906-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6906DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 30 mm bore puts 61906 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61906 at 7.95 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.95/5 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6906DDU on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61906; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-2RS-NSK bearing?",
        "a": "A 61906-2RS-NSK deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61906 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61906 uses the same ISO 15 envelope (30×47×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61906-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61906-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61906 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61906?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6906DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×47×9 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6906DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906-2RS",
      "61906-2rs",
      "6906DDU",
      "NSK 6906DDU",
      "61906-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6906VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.95,
    "static_load_kN": 5,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6906VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 30 mm shaft for 61906 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section at 30 mm bore (8.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61906-RSR-NSK run faster than contact-seal 61906-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61906-2RS instead.",
      "The non-contact lip of 61906-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6906VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 30 mm bore puts 61906 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61906 at 7.95 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.95/5 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6906VV on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61906; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61906 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-RSR-NSK bearing?",
        "a": "A 61906-RSR-NSK deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61906 bore code work?",
        "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61906-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61906?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6906VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×47×9 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61906 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906-RSR",
      "61906-rsr",
      "6906VV",
      "NSK 6906VV",
      "61906-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6906ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.95,
    "static_load_kN": 5,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6906ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 30 mm shaft for 61906 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61906-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61906-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61906-C3. No clearance suffix means normal CN clearance.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6906ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 30 mm bore puts 61906 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61906 at 7.95 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.95/5 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6906ZZ on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-ZZ bearing?",
        "a": "A 61906-ZZ deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61906-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61906-ZZ need?",
        "a": "61906-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61906?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6906ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×47×9 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6906ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906-ZZ",
      "61906-zz",
      "6906ZZ",
      "NSK 6906ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61906-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6906",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 47,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.95,
    "static_load_kN": 5,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61906 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 47 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61906-NSK.",
      "The 619xx thin section (8.5 mm section height at 30 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61906-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 30×47×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61906-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 30 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61906-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61906-NSK.",
      "The open 61906 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 30 mm bore puts 61906 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61906 at 7.95 kN dynamic (C) and 5 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 61906 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×47×9 mm envelope of 61906 gives a D/d ratio of 1.57 and 8.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 7.95/5 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6906 on the 30×47×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61906 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61906 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61906-NSK bearing?",
        "a": "A 61906-NSK deep-groove ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61906 bore code work?",
        "a": "The last two digits of 61906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61906 mean?",
        "a": "A bare 61906 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61906?",
        "a": "NSK lists the open 61906 under the bare designation 6906; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6906 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61906-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61906-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61906",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×47×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61906",
      "6906",
      "NSK 6906",
      "61906-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6907DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.6,
    "static_load_kN": 7.25,
    "weight_g": 75,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6907DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61907-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Heat is the enemy of the sealed 61907-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61907-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 61907-2RS-NSK drags the lip and overheats it.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the contact-sealed version as 6907DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 35 mm bore puts 61907 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61907 at 11.6 kN dynamic (C) and 7.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 75 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 11.6/7.25 kN load ratings, mass 75 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6907DDU on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61907; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-2RS-NSK bearing?",
        "a": "A 61907-2RS-NSK deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61907 bore code work?",
        "a": "The last two digits of 61907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61907-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61907?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6907DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×55×10 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6907DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907-2RS",
      "61907-2rs",
      "6907DDU",
      "NSK 6907DDU",
      "61907-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6907VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.6,
    "static_load_kN": 7.25,
    "weight_g": 75,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6907VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-RSR-NSK.",
      "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61907-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61907-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 35 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61907-RSR-NSK.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6907VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 35 mm bore puts 61907 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61907 at 11.6 kN dynamic (C) and 7.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 75 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 11.6/7.25 kN load ratings, mass 75 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6907VV on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61907; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-RSR-NSK bearing?",
        "a": "A 61907-RSR-NSK deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61907-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61907-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61907 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61907-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61907?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6907VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×55×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61907 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907-RSR",
      "61907-rsr",
      "6907VV",
      "NSK 6907VV",
      "61907-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6907ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.6,
    "static_load_kN": 7.25,
    "weight_g": 75,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6907ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-ZZ.",
      "The 619xx thin section (10.0 mm section height at 35 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61907-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61907-2RS for that.",
      "Shielded 61907-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 55 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61907-ZZ.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6907ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 35 mm bore puts 61907 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61907 at 11.6 kN dynamic (C) and 7.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 75 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 11.6/7.25 kN load ratings, mass 75 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6907ZZ on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-ZZ bearing?",
        "a": "A 61907-ZZ deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61907-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61907-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61907 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61907-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61907?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6907ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×55×10 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61907 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907-ZZ",
      "61907-zz",
      "6907ZZ",
      "NSK 6907ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61907-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6907",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 55,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 11.6,
    "static_load_kN": 7.25,
    "weight_g": 75,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61907-NSK.",
      "The 619xx thin section at 35 mm bore (10.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61907-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 35×55×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61907-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "The housing bore for the 55 mm OD should be round within IT7; an oval bore pinches the outer ring of 61907-NSK and shows up later as two-point loaded raceway wear.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61907 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 35 mm bore puts 61907 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 61907 at 11.6 kN dynamic (C) and 7.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 75 g, 61907 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 35×55×10 mm envelope of 61907 gives a D/d ratio of 1.57 and 10.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 11.6/7.25 kN load ratings, mass 75 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6907 on the 35×55×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61907 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61907-NSK bearing?",
        "a": "A 61907-NSK deep-groove ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61907 mean?",
        "a": "A bare 61907 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61900 compare with other series at the same 35 mm bore?",
        "a": "619 is a thin section one step above 618: 55×10 mm with a 10.0 mm radial section at 35 mm bore; a 6207 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK order number for an open 61907?",
        "a": "NSK lists the open 61907 under the bare designation 6907; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61907 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61907-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61907-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61907-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×55×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61907",
      "6907",
      "NSK 6907",
      "61907-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61908-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6908DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 62,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 10,
    "weight_g": 112,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6908DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-2RS-NSK.",
      "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61908-2RS-NSK runs slower and cooler-limited than the open 61908; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61908-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6908DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 40 mm bore puts 61908 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15 kN dynamic load rating (C) and 10 kN static (C0), 61908 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 112 g, 61908 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×62×12 mm envelope of 61908 gives a D/d ratio of 1.55 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15/10 kN load ratings, mass 112 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6908DDU on the 40×62×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61908 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61908 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61908-2RS-NSK bearing?",
        "a": "A 61908-2RS-NSK deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61900 compare with other series at the same 40 mm bore?",
        "a": "619 is a thin section one step above 618: 62×12 mm with an 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61908 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61908 uses the same ISO 15 envelope (40×62×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61908?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6908DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×62×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6908DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61908-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61908-2RS",
      "61908-2rs",
      "6908DDU",
      "NSK 6908DDU",
      "61908-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61908-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6908VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 62,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 10,
    "weight_g": 112,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6908VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-RSR-NSK.",
      "The 619xx thin section (11.0 mm section height at 40 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "RSR low-friction seals on 61908-RSR-NSK run faster than contact-seal 61908-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61908-2RS instead.",
      "The non-contact lip of 61908-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61908-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6908VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 40 mm bore puts 61908 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15 kN dynamic load rating (C) and 10 kN static (C0), 61908 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 112 g, 61908 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×62×12 mm envelope of 61908 gives a D/d ratio of 1.55 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15/10 kN load ratings, mass 112 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6908VV on the 40×62×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61908 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61908; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61908-RSR-NSK bearing?",
        "a": "A 61908-RSR-NSK deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61908-RSR-NSK need?",
        "a": "61908-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61908 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61908 bore code work?",
        "a": "The last two digits of 61908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61908?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6908VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×62×12 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61908 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61908-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61908-RSR",
      "61908-rsr",
      "6908VV",
      "NSK 6908VV",
      "61908-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61908-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6908ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 62,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 10,
    "weight_g": 112,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6908ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61908-ZZ.",
      "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61908-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61908-2RS for that.",
      "Shielded 61908-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Never mix components between two 61908-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6908ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 40 mm bore puts 61908 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15 kN dynamic load rating (C) and 10 kN static (C0), 61908 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 112 g, 61908 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×62×12 mm envelope of 61908 gives a D/d ratio of 1.55 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15/10 kN load ratings, mass 112 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6908ZZ on the 40×62×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61908 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61908; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61908-ZZ bearing?",
        "a": "A 61908-ZZ deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61908-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61908-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61908 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61908-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61908?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6908ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×62×12 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61908 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61908-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61908-ZZ",
      "61908-zz",
      "6908ZZ",
      "NSK 6908ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61908-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6908",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 62,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 10,
    "weight_g": 112,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61908 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 62 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 40 mm shaft for 61908 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section at 40 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61908-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 40×62×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61908 units.",
      "Never mix components between two 61908-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61908-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61908 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 40 mm bore puts 61908 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15 kN dynamic load rating (C) and 10 kN static (C0), 61908 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 112 g, 61908 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 40×62×12 mm envelope of 61908 gives a D/d ratio of 1.55 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15/10 kN load ratings, mass 112 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6908 on the 40×62×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61908 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61908 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61908-NSK bearing?",
        "a": "A 61908-NSK deep-groove ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 40 mm bore?",
        "a": "619 is a thin section one step above 618: 62×12 mm with an 11.0 mm radial section at 40 mm bore; a 6208 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61908 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61908 uses the same ISO 15 envelope (40×62×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61908?",
        "a": "NSK lists the open 61908 under the bare designation 6908; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6908?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61908-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61908-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61908-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×62×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61908",
      "6908",
      "NSK 6908",
      "61908-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61909-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6909DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 68,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.5,
    "static_load_kN": 10.9,
    "weight_g": 126,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6909DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61909-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 619xx thin section at 45 mm bore (11.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Heat is the enemy of the sealed 61909-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61909-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 61909-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61909-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6909DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 45 mm bore puts 61909 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.5 kN dynamic load rating (C) and 10.9 kN static (C0), 61909 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 126 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15.5/10.9 kN load ratings, mass 126 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6909DDU on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61909 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61909; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61909-2RS-NSK bearing?",
        "a": "A 61909-2RS-NSK deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61909-2RS-NSK need?",
        "a": "61909-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61909 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61909 bore code work?",
        "a": "The last two digits of 61909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61909?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6909DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×68×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6909DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61909-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61909-2RS",
      "61909-2rs",
      "6909DDU",
      "NSK 6909DDU",
      "61909-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61909-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6909VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 68,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.5,
    "static_load_kN": 10.9,
    "weight_g": 126,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6909VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61909-RSR-NSK.",
      "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The low-drag lip of 61909-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61909-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.",
      "Vibration during standstill brinells the raceways of a 45 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The housing bore for the 68 mm OD should be round within IT7; an oval bore pinches the outer ring of 61909-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6909VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 45 mm bore puts 61909 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.5 kN dynamic load rating (C) and 10.9 kN static (C0), 61909 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 126 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15.5/10.9 kN load ratings, mass 126 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6909VV on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61909-RSR-NSK bearing?",
        "a": "A 61909-RSR-NSK deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61909-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61909-RSR-NSK need?",
        "a": "61909-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61909 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61909?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6909VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×68×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6909VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61909-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61909-RSR",
      "61909-rsr",
      "6909VV",
      "NSK 6909VV",
      "61909-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61909-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6909ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 68,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.5,
    "static_load_kN": 10.9,
    "weight_g": 126,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61909-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 68 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6909ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 61909-ZZ.",
      "The 619xx thin section at 45 mm bore (11.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Do not wash 61909-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61909-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6909ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 45 mm bore puts 61909 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.5 kN dynamic load rating (C) and 10.9 kN static (C0), 61909 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 126 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15.5/10.9 kN load ratings, mass 126 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6909ZZ on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61909-ZZ bearing?",
        "a": "A 61909-ZZ deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61909-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61909-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61909 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61909-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61909?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6909ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×68×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6909ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61909-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61909-ZZ",
      "61909-zz",
      "6909ZZ",
      "NSK 6909ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61909-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6909",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 68,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.5,
    "static_load_kN": 10.9,
    "weight_g": 126,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "A 45 mm shaft for 61909 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 619xx thin section (11.5 mm section height at 45 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61909-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 45×68×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61909 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61909 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 45 mm bore puts 61909 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.5 kN dynamic load rating (C) and 10.9 kN static (C0), 61909 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 126 g, 61909 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 45×68×12 mm envelope of 61909 gives a D/d ratio of 1.51 and 11.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 15.5/10.9 kN load ratings, mass 126 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6909 on the 45×68×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61909 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61909-NSK bearing?",
        "a": "A 61909-NSK deep-groove ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61909 mean?",
        "a": "A bare 61909 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61900 compare with other series at the same 45 mm bore?",
        "a": "619 is a thin section one step above 618: 68×12 mm with an 11.5 mm radial section at 45 mm bore; a 6209 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK order number for an open 61909?",
        "a": "NSK lists the open 61909 under the bare designation 6909; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 45 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61909 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61909-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61909-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W61909-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×68×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61909",
      "6909",
      "NSK 6909",
      "61909-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61910-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6910DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 72,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 16,
    "static_load_kN": 11.7,
    "weight_g": 135,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61910-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6910DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.",
      "The 619xx thin section (11.0 mm section height at 50 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Heat is the enemy of the sealed 61910-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61910-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61910-2RS-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6910DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 50 mm bore puts 61910 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 16 kN dynamic load rating (C) and 11.7 kN static (C0), 61910 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 135 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 16/11.7 kN load ratings, mass 135 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6910DDU on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61910-2RS-NSK bearing?",
        "a": "A 61910-2RS-NSK deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61910-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61910-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61910-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61910?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6910DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×72×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6910DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61910-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61910-2RS",
      "61910-2rs",
      "6910DDU",
      "NSK 6910DDU",
      "61910-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61910-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6910VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 72,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 16,
    "static_load_kN": 11.7,
    "weight_g": 135,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61910-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6910VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61910 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61910-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61910-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61910-RSR-NSK.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6910VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 50 mm bore puts 61910 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 16 kN dynamic load rating (C) and 11.7 kN static (C0), 61910 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 135 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 16/11.7 kN load ratings, mass 135 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6910VV on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61910-RSR-NSK bearing?",
        "a": "A 61910-RSR-NSK deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61910-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61910-RSR-NSK need?",
        "a": "61910-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61910 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61910?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6910VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×72×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6910VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61910-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61910-RSR",
      "61910-rsr",
      "6910VV",
      "NSK 6910VV",
      "61910-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61910-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6910ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 72,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 16,
    "static_load_kN": 11.7,
    "weight_g": 135,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61910-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 72 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6910ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.",
      "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61910-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61910-2RS for that.",
      "Shielded 61910-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 72 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61910-ZZ.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6910ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 50 mm bore puts 61910 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 16 kN dynamic load rating (C) and 11.7 kN static (C0), 61910 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 135 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 16/11.7 kN load ratings, mass 135 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6910ZZ on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61910 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61910-ZZ bearing?",
        "a": "A 61910-ZZ deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 61910-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61910-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61910 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61910-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61910?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6910ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×72×12 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6910ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61910-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61910-ZZ",
      "61910-zz",
      "6910ZZ",
      "NSK 6910ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61910-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6910",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 72,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 16,
    "static_load_kN": 11.7,
    "weight_g": 135,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61910 with C3 for those conditions.",
      "The 619xx thin section at 50 mm bore (11.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61910-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 50×72×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61910-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61910-NSK.",
      "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 61910-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61910 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 50 mm bore puts 61910 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 16 kN dynamic load rating (C) and 11.7 kN static (C0), 61910 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 135 g, 61910 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 50×72×12 mm envelope of 61910 gives a D/d ratio of 1.44 and 11.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 16/11.7 kN load ratings, mass 135 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6910 on the 50×72×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61910 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61910; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61910-NSK bearing?",
        "a": "A 61910-NSK deep-groove ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61910 mean?",
        "a": "A bare 61910 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61900 compare with other series at the same 50 mm bore?",
        "a": "619 is a thin section one step above 618: 72×12 mm with an 11.0 mm radial section at 50 mm bore; a 6210 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK order number for an open 61910?",
        "a": "NSK lists the open 61910 under the bare designation 6910; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 50 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61910 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61910-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61910-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×72×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61910",
      "6910",
      "NSK 6910",
      "61910-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6911DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 13.3,
    "weight_g": 189,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61911-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 80 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6911DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61911 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61911-2RS-NSK runs slower and cooler-limited than the open 61911; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61911-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61911-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6911DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 55 mm bore 61911 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 17.6 kN dynamic load rating (C) and 13.3 kN static (C0), 61911 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 189 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 17.6/13.3 kN load ratings, mass 189 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6911DDU on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61911 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-2RS-NSK bearing?",
        "a": "A 61911-2RS-NSK deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 61911 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61911-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61911-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61911 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61911?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6911DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×80×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6911DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911-2RS",
      "61911-2rs",
      "6911DDU",
      "NSK 6911DDU",
      "61911-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6911VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 13.3,
    "weight_g": 189,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6911VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61911 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The low-drag lip of 61911-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61911-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 61911-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 61911-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6911VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 55 mm bore 61911 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 17.6 kN dynamic load rating (C) and 13.3 kN static (C0), 61911 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 189 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 17.6/13.3 kN load ratings, mass 189 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6911VV on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-RSR-NSK bearing?",
        "a": "A 61911-RSR-NSK deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61911 bore code work?",
        "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61911-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61911?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6911VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×80×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61911 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911-RSR",
      "61911-rsr",
      "6911VV",
      "NSK 6911VV",
      "61911-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6911ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 13.3,
    "weight_g": 189,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61911-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 80 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6911ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61911 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section (12.5 mm section height at 55 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61911-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61911-2RS for that.",
      "Shielded 61911-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6911ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 55 mm bore 61911 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 17.6 kN dynamic load rating (C) and 13.3 kN static (C0), 61911 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 189 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 17.6/13.3 kN load ratings, mass 189 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6911ZZ on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-ZZ bearing?",
        "a": "A 61911-ZZ deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61911 bore code work?",
        "a": "The last two digits of 61911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61911-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61911?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6911ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×80×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6911ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911-ZZ",
      "61911-zz",
      "6911ZZ",
      "NSK 6911ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61911-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6911",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 80,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.6,
    "static_load_kN": 13.3,
    "weight_g": 189,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61911 with C3 for those conditions.",
      "The 619xx thin section at 55 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61911-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 55×80×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61911 units.",
      "The housing bore for the 80 mm OD should be round within IT7; an oval bore pinches the outer ring of 61911-NSK and shows up later as two-point loaded raceway wear.",
      "Never mix components between two 61911-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 61911 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 55 mm bore 61911 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 17.6 kN dynamic load rating (C) and 13.3 kN static (C0), 61911 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 189 g, 61911 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 55×80×13 mm envelope of 61911 gives a D/d ratio of 1.45 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 17.6/13.3 kN load ratings, mass 189 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6911 on the 55×80×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61911 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61911 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61911-NSK bearing?",
        "a": "A 61911-NSK deep-groove ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 55 mm bore?",
        "a": "619 is a thin section one step above 618: 80×13 mm with a 12.5 mm radial section at 55 mm bore; a 6211 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61911 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61911 uses the same ISO 15 envelope (55×80×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61911?",
        "a": "NSK lists the open 61911 under the bare designation 6911; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6911?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61911-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61911-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×80×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61911",
      "6911",
      "NSK 6911",
      "61911-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61912-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6912DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 16.3,
    "weight_g": 192,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6912DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section (12.5 mm section height at 60 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61912-2RS-NSK runs slower and cooler-limited than the open 61912; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61912-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 61912-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61912-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6912DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 60 mm bore 61912 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.4 kN dynamic load rating (C) and 16.3 kN static (C0), 61912 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 192 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 21.4/16.3 kN load ratings, mass 192 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6912DDU on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61912-2RS-NSK bearing?",
        "a": "A 61912-2RS-NSK deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 61912-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61912-2RS-NSK need?",
        "a": "61912-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61912 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61912?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6912DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×85×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6912DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61912-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61912-2RS",
      "61912-2rs",
      "6912DDU",
      "NSK 6912DDU",
      "61912-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61912-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6912VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 16.3,
    "weight_g": 192,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6912VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61912 with C3 for those conditions.",
      "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61912-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61912-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Never mix components between two 61912-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues this low-friction non-contact seal as 6912VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 60 mm bore 61912 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.4 kN dynamic load rating (C) and 16.3 kN static (C0), 61912 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 192 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 21.4/16.3 kN load ratings, mass 192 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6912VV on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61912 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61912-RSR-NSK bearing?",
        "a": "A 61912-RSR-NSK deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61912 bore code work?",
        "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61912-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61912?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6912VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×85×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6912VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61912-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61912-RSR",
      "61912-rsr",
      "6912VV",
      "NSK 6912VV",
      "61912-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61912-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6912ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 16.3,
    "weight_g": 192,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61912-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 85 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6912ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61912-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61912-2RS for that.",
      "Do not wash 61912-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6912ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 60 mm bore 61912 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.4 kN dynamic load rating (C) and 16.3 kN static (C0), 61912 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 192 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 21.4/16.3 kN load ratings, mass 192 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6912ZZ on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61912 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61912-ZZ bearing?",
        "a": "A 61912-ZZ deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61912 bore code work?",
        "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61912-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61912?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6912ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×85×13 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6912ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61912-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61912-ZZ",
      "61912-zz",
      "6912ZZ",
      "NSK 6912ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61912-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6912",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 16.3,
    "weight_g": 192,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61912 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 60 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61912-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 60×85×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61912 units.",
      "The housing bore for the 85 mm OD should be round within IT7; an oval bore pinches the outer ring of 61912-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61912 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 60 mm bore 61912 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 21.4 kN dynamic load rating (C) and 16.3 kN static (C0), 61912 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 192 g, 61912 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 60×85×13 mm envelope of 61912 gives a D/d ratio of 1.42 and 12.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 21.4/16.3 kN load ratings, mass 192 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6912 on the 60×85×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61912 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61912; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61912-NSK bearing?",
        "a": "A 61912-NSK deep-groove ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61912 bore code work?",
        "a": "The last two digits of 61912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61912 mean?",
        "a": "A bare 61912 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61912?",
        "a": "NSK lists the open 61912 under the bare designation 6912; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 60 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6912?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61912-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61912-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×85×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61912",
      "6912",
      "NSK 6912",
      "61912-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61913-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6913DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 19.1,
    "static_load_kN": 16.1,
    "weight_g": 218,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61913-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6913DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61913 with C3 for those conditions.",
      "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Heat is the enemy of the sealed 61913-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61913-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61913-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6913DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 65 mm bore 61913 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 19.1 kN dynamic load rating (C) and 16.1 kN static (C0), 61913 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 218 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 19.1/16.1 kN load ratings, mass 218 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6913DDU on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61913-2RS-NSK bearing?",
        "a": "A 61913-2RS-NSK deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61913-2RS-NSK need?",
        "a": "61913-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61913 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61913 bore code work?",
        "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61913?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6913DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×90×13 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6913DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61913-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61913-2RS",
      "61913-2rs",
      "6913DDU",
      "NSK 6913DDU",
      "61913-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61913-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6913VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 19.1,
    "static_load_kN": 16.1,
    "weight_g": 218,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61913-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6913VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61913 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61913-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61913-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61913-RSR-NSK-C3. No clearance suffix means normal CN clearance.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6913VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 65 mm bore 61913 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 19.1 kN dynamic load rating (C) and 16.1 kN static (C0), 61913 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 218 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 19.1/16.1 kN load ratings, mass 218 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6913VV on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61913 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61913-RSR-NSK bearing?",
        "a": "A 61913-RSR-NSK deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61913 bore code work?",
        "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61913-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61913?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6913VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×90×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61913 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61913-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61913-RSR",
      "61913-rsr",
      "6913VV",
      "NSK 6913VV",
      "61913-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61913-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6913ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 19.1,
    "static_load_kN": 16.1,
    "weight_g": 218,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6913ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61913 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 65 mm bore (12.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61913-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61913-2RS for that.",
      "Shielded 61913-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Measure the shaft, do not trust the drawing: a 65 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61913-ZZ.",
      "NSK catalogues the shielded version as 6913ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 65 mm bore 61913 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 19.1 kN dynamic load rating (C) and 16.1 kN static (C0), 61913 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 218 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 19.1/16.1 kN load ratings, mass 218 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6913ZZ on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61913 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61913-ZZ bearing?",
        "a": "A 61913-ZZ deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61913-ZZ need?",
        "a": "61913-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61913 bore code work?",
        "a": "The last two digits of 61913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61913?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6913ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×90×13 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6913ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61913-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61913-ZZ",
      "61913-zz",
      "6913ZZ",
      "NSK 6913ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61913-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6913",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 19.1,
    "static_load_kN": 16.1,
    "weight_g": 218,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61913 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 90 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61913 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section (12.5 mm section height at 65 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61913-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 65×90×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61913 units.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 61913 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 65 mm bore 61913 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 19.1 kN dynamic load rating (C) and 16.1 kN static (C0), 61913 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 218 g, 61913 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 65×90×13 mm envelope of 61913 gives a D/d ratio of 1.38 and only 12.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 19.1/16.1 kN load ratings, mass 218 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6913 on the 65×90×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61913 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61913 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61913-NSK bearing?",
        "a": "A 61913-NSK deep-groove ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61913-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61913-NSK need?",
        "a": "The open 61913-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61913?",
        "a": "NSK lists the open 61913 under the bare designation 6913; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 65 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6913 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61913-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61913-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×90×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61913",
      "6913",
      "NSK 6913",
      "61913-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61914-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6914DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 100,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.1,
    "static_load_kN": 21.2,
    "weight_g": 349,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61914-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6914DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61914 with C3 for those conditions.",
      "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61914-2RS-NSK runs slower and cooler-limited than the open 61914; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61914-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61914-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6914DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 70 mm bore 61914 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.1 kN dynamic load rating (C) and 21.2 kN static (C0), 61914 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 349 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.1/21.2 kN load ratings, mass 349 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6914DDU on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61914; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61914 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61914-2RS-NSK bearing?",
        "a": "A 61914-2RS-NSK deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61914-2RS-NSK need?",
        "a": "61914-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61914 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61914 bore code work?",
        "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61914?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6914DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×100×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61914 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61914-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61914-2RS",
      "61914-2rs",
      "6914DDU",
      "NSK 6914DDU",
      "61914-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61914-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6914VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 100,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.1,
    "static_load_kN": 21.2,
    "weight_g": 349,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61914-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6914VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61914 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "RSR low-friction seals on 61914-RSR-NSK run faster than contact-seal 61914-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61914-2RS instead.",
      "The low-drag lip of 61914-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61914-RSR-NSK-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6914VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 70 mm bore 61914 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.1 kN dynamic load rating (C) and 21.2 kN static (C0), 61914 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 349 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.1/21.2 kN load ratings, mass 349 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6914VV on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61914 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61914-RSR-NSK bearing?",
        "a": "A 61914-RSR-NSK deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 61914 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61914 uses the same ISO 15 envelope (70×100×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61914-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61914-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61914 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61914?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6914VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×100×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6914VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61914-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61914-RSR",
      "61914-rsr",
      "6914VV",
      "NSK 6914VV",
      "61914-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61914-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6914ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 100,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.1,
    "static_load_kN": 21.2,
    "weight_g": 349,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6914ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 70 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61914 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 619xx thin section at 70 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61914-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61914-2RS for that.",
      "Shielded 61914-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61914-ZZ drags the lip and overheats it.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61914-ZZ.",
      "NSK catalogues the shielded version as 6914ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 70 mm bore 61914 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.1 kN dynamic load rating (C) and 21.2 kN static (C0), 61914 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 349 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.1/21.2 kN load ratings, mass 349 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6914ZZ on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61914 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61914-ZZ bearing?",
        "a": "A 61914-ZZ deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61914 bore code work?",
        "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61914-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61914?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6914ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×100×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61914 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61914-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61914-ZZ",
      "61914-zz",
      "6914ZZ",
      "NSK 6914ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61914-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6914",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 100,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.1,
    "static_load_kN": 21.2,
    "weight_g": 349,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61914 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 100 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61914 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section (15.0 mm section height at 70 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61914-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 70×100×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61914 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61914-NSK.",
      "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61914 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 70 mm bore 61914 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.1 kN dynamic load rating (C) and 21.2 kN static (C0), 61914 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 349 g, 61914 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 70×100×16 mm envelope of 61914 gives a D/d ratio of 1.43 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.1/21.2 kN load ratings, mass 349 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6914 on the 70×100×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61914 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61914 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61914-NSK bearing?",
        "a": "A 61914-NSK deep-groove ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61914 bore code work?",
        "a": "The last two digits of 61914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61914 mean?",
        "a": "A bare 61914 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61914?",
        "a": "NSK lists the open 61914 under the bare designation 6914; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 70 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6914?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61914-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61914-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×100×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61914",
      "6914",
      "NSK 6914",
      "61914-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61915-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6915DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 105,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.8,
    "static_load_kN": 22.6,
    "weight_g": 364,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6915DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61915-2RS-NSK runs slower and cooler-limited than the open 61915; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61915-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61915-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6915DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 75 mm bore 61915 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.8 kN dynamic load rating (C) and 22.6 kN static (C0), 61915 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 364 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.8/22.6 kN load ratings, mass 364 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6915DDU on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61915 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61915-2RS-NSK bearing?",
        "a": "A 61915-2RS-NSK deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61915 bore code work?",
        "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61915-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61915?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6915DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×105×16 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6915DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61915-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61915-2RS",
      "61915-2rs",
      "6915DDU",
      "NSK 6915DDU",
      "61915-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61915-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6915VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 105,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.8,
    "static_load_kN": 22.6,
    "weight_g": 364,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61915-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6915VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.",
      "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61915-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61915-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 75 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61915-RSR-NSK.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61915-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6915VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 75 mm bore 61915 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.8 kN dynamic load rating (C) and 22.6 kN static (C0), 61915 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 364 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.8/22.6 kN load ratings, mass 364 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6915VV on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61915-RSR-NSK bearing?",
        "a": "A 61915-RSR-NSK deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61915-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61915-RSR-NSK need?",
        "a": "61915-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61915 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61915?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6915VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×105×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6915VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61915-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61915-RSR",
      "61915-rsr",
      "6915VV",
      "NSK 6915VV",
      "61915-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61915-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6915ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 105,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.8,
    "static_load_kN": 22.6,
    "weight_g": 364,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6915ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61915 with C3 clearance and re-check the residual value after mounting.",
      "The 619xx thin section at 75 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61915-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61915-2RS for that.",
      "Shielded 61915-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 16 mm-wide ring of 61915-ZZ drags the lip and overheats it.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6915ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 75 mm bore 61915 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.8 kN dynamic load rating (C) and 22.6 kN static (C0), 61915 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 364 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.8/22.6 kN load ratings, mass 364 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6915ZZ on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61915-ZZ bearing?",
        "a": "A 61915-ZZ deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61915-ZZ need?",
        "a": "61915-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61915 bore code work?",
        "a": "The last two digits of 61915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61915?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6915ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×105×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6915ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61915-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61915-ZZ",
      "61915-zz",
      "6915ZZ",
      "NSK 6915ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61915-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6915",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 105,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 26.8,
    "static_load_kN": 22.6,
    "weight_g": 364,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61915 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 105 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61915 with C3 for those conditions.",
      "The 619xx thin section (15.0 mm section height at 75 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61915-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 75×105×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61915-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "The housing bore for the 105 mm OD should be round within IT7; an oval bore pinches the outer ring of 61915-NSK and shows up later as two-point loaded raceway wear.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 61915 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 75 mm bore 61915 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 26.8 kN dynamic load rating (C) and 22.6 kN static (C0), 61915 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 364 g, 61915 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 75×105×16 mm envelope of 61915 gives a D/d ratio of 1.40 and 15.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 26.8/22.6 kN load ratings, mass 364 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6915 on the 75×105×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61915 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61915-NSK bearing?",
        "a": "A 61915-NSK deep-groove ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61915-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 75 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61915-NSK need?",
        "a": "The open 61915-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61915?",
        "a": "NSK lists the open 61915 under the bare designation 6915; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 75 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6915 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61915-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61915-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×105×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61915",
      "6915",
      "NSK 6915",
      "61915-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61916-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6916DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 110,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 27.4,
    "static_load_kN": 24,
    "weight_g": 391,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61916-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 110 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6916DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 80 mm of 61916-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61916-2RS-NSK runs slower and cooler-limited than the open 61916; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61916-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 80 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6916DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 80 mm bore 61916 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 27.4 kN dynamic load rating (C) and 24 kN static (C0), 61916 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 391 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 27.4/24 kN load ratings, mass 391 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6916DDU on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61916 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61916-2RS-NSK bearing?",
        "a": "A 61916-2RS-NSK deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61916-2RS-NSK need?",
        "a": "61916-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61916 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61916 bore code work?",
        "a": "The last two digits of 61916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61916?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6916DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×110×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6916DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61916-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61916-2RS",
      "61916-2rs",
      "6916DDU",
      "NSK 6916DDU",
      "61916-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61916-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6916VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 110,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 27.4,
    "static_load_kN": 24,
    "weight_g": 391,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6916VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 61916 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 80 mm bore (15.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The low-drag lip of 61916-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 61916-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61916-RSR-NSK-C3. No clearance suffix means normal CN clearance.",
      "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6916VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 80 mm bore 61916 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 27.4 kN dynamic load rating (C) and 24 kN static (C0), 61916 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 391 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 27.4/24 kN load ratings, mass 391 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6916VV on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61916-RSR-NSK bearing?",
        "a": "A 61916-RSR-NSK deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 61916-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 61900 compare with other series at the same 80 mm bore?",
        "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61916?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6916VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×110×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6916VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61916-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61916-RSR",
      "61916-rsr",
      "6916VV",
      "NSK 6916VV",
      "61916-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61916-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6916ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 110,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 27.4,
    "static_load_kN": 24,
    "weight_g": 391,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6916ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 80 mm of 61916-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61916-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61916-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6916ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 80 mm bore 61916 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 27.4 kN dynamic load rating (C) and 24 kN static (C0), 61916 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 391 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 27.4/24 kN load ratings, mass 391 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6916ZZ on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61916-ZZ bearing?",
        "a": "A 61916-ZZ deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61916 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61916 uses the same ISO 15 envelope (80×110×16 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61916-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61916-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61916 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61916?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6916ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×110×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6916ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61916-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61916-ZZ",
      "61916-zz",
      "6916ZZ",
      "NSK 6916ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61916-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6916",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 110,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 27.4,
    "static_load_kN": 24,
    "weight_g": 391,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 80 mm of 61916-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (15.0 mm section height at 80 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Storage matters for open bearings: 61916-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61916 units.",
      "Never mix components between two 61916-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61916 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 80 mm bore 61916 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 27.4 kN dynamic load rating (C) and 24 kN static (C0), 61916 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 391 g, 61916 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 80×110×16 mm envelope of 61916 gives a D/d ratio of 1.38 and only 15.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 27.4/24 kN load ratings, mass 391 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6916 on the 80×110×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61916 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61916-NSK bearing?",
        "a": "A 61916-NSK deep-groove ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61916 mean?",
        "a": "A bare 61916 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61900 compare with other series at the same 80 mm bore?",
        "a": "619 is a thin section one step above 618: 110×16 mm with a 15.0 mm radial section at 80 mm bore; a 6216 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK order number for an open 61916?",
        "a": "NSK lists the open 61916 under the bare designation 6916; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 80 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6916?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61916-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61916-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×110×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61916",
      "6916",
      "NSK 6916",
      "61916-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61917-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6917DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 120,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 35,
    "static_load_kN": 29.6,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61917-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 120 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6917DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 85 mm of 61917-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (17.5 mm section height at 85 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61917-2RS runs slower and cooler-limited than the open 61917; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61917-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61917-2RS.",
      "NSK catalogues the contact-sealed version as 6917DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 85 mm bore 61917 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61917 at 35 kN dynamic (C) and 29.6 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 550 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 35/29.6 kN load ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917DDU on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61917; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61917 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61917-2RS bearing?",
        "a": "A 61917-2RS deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 61917 bore code work?",
        "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 61917-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 61917?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6917DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×120×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61917 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61917-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61917-2RS",
      "61917-2rs",
      "6917DDU",
      "NSK 6917DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61917-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6917VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 120,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 35,
    "static_load_kN": 29.6,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6917VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 85 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61917-RSR run faster than contact-seal 61917-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61917-2RS instead.",
      "The non-contact lip of 61917-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6917VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 85 mm bore 61917 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61917 at 35 kN dynamic (C) and 29.6 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 550 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 35/29.6 kN load ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917VV on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61917; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61917-RSR bearing?",
        "a": "A 61917-RSR deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61917 bore code work?",
        "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 61917-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 61917?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6917VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×120×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6917VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61917-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61917-RSR",
      "61917-rsr",
      "6917VV",
      "NSK 6917VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61917-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6917ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 120,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 35,
    "static_load_kN": 29.6,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61917-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 120 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6917ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 85 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Do not wash 61917-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61917-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Never mix components between two 61917-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6917ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 85 mm bore 61917 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61917 at 35 kN dynamic (C) and 29.6 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 550 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 35/29.6 kN load ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917ZZ on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61917; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61917-ZZ bearing?",
        "a": "A 61917-ZZ deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61917 bore code work?",
        "a": "The last two digits of 61917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61917-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61917?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6917ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×120×18 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6917ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61917-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61917-ZZ",
      "61917-zz",
      "6917ZZ",
      "NSK 6917ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61917-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6917",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 120,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 35,
    "static_load_kN": 29.6,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61917 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 120 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 85 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61917-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61917 units.",
      "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61917-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61917-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61917 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 85 mm bore 61917 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61917 at 35 kN dynamic (C) and 29.6 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 550 g, 61917 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 85×120×18 mm envelope of 61917 gives a D/d ratio of 1.41 and 17.5 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 35/29.6 kN load ratings, mass 550 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6917 on the 85×120×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61917 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61917; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61917-NSK bearing?",
        "a": "A 61917-NSK deep-groove ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 85 mm bore?",
        "a": "619 is a thin section one step above 618: 120×18 mm with a 17.5 mm radial section at 85 mm bore; a 6217 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61917 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61917 uses the same ISO 15 envelope (85×120×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61917?",
        "a": "NSK lists the open 61917 under the bare designation 6917; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 85 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6917 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61917-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61917",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×120×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61917",
      "6917",
      "NSK 6917",
      "61917-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61918-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6918DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 125,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36,
    "static_load_kN": 31.5,
    "weight_g": 585,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61918-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 125 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6918DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 61918-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (17.5 mm section height at 90 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61918-2RS runs slower and cooler-limited than the open 61918; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61918-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 125 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61918-2RS.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6918DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 90 mm bore 61918 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61918 at 36 kN dynamic (C) and 31.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 585 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 36/31.5 kN load ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918DDU on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61918-2RS bearing?",
        "a": "A 61918-2RS deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61918-2RS need?",
        "a": "61918-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61918 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61918 bore code work?",
        "a": "The last two digits of 61918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61918?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6918DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×125×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61918 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61918-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61918-2RS",
      "61918-2rs",
      "6918DDU",
      "NSK 6918DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61918-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6918VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 125,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36,
    "static_load_kN": 31.5,
    "weight_g": 585,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6918VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 61918 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 90 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61918-RSR run faster than contact-seal 61918-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61918-2RS instead.",
      "The non-contact lip of 61918-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61918-RSR.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6918VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 90 mm bore 61918 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61918 at 36 kN dynamic (C) and 31.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 585 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 36/31.5 kN load ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918VV on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61918; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61918-RSR bearing?",
        "a": "A 61918-RSR deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61900 compare with other series at the same 90 mm bore?",
        "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61918 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61918 uses the same ISO 15 envelope (90×125×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61918?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6918VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×125×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6918VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61918-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61918-RSR",
      "61918-rsr",
      "6918VV",
      "NSK 6918VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61918-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6918ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 125,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36,
    "static_load_kN": 31.5,
    "weight_g": 585,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61918-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 125 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6918ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 61918 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 90 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61918-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61918-2RS for that.",
      "Do not wash 61918-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 18 mm-wide ring of 61918-ZZ drags the lip and overheats it.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6918ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 90 mm bore 61918 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61918 at 36 kN dynamic (C) and 31.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 585 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 36/31.5 kN load ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918ZZ on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61918-ZZ bearing?",
        "a": "A 61918-ZZ deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61918 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61918 uses the same ISO 15 envelope (90×125×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61918-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61918-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61918 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61918?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6918ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×125×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6918ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61918-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61918-ZZ",
      "61918-zz",
      "6918ZZ",
      "NSK 6918ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61918-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6918",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 125,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36,
    "static_load_kN": 31.5,
    "weight_g": 585,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61918 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 125 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 61918-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 90 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61918-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61918 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61918-NSK.",
      "The open 61918 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 90 mm bore 61918 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61918 at 36 kN dynamic (C) and 31.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 585 g, 61918 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 90×125×18 mm envelope of 61918 gives a D/d ratio of 1.39 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 36/31.5 kN load ratings, mass 585 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6918 on the 90×125×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61918 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61918 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61918-NSK bearing?",
        "a": "A 61918-NSK deep-groove ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 90 mm bore?",
        "a": "619 is a thin section one step above 618: 125×18 mm with a 17.5 mm radial section at 90 mm bore; a 6218 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61918 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61918 uses the same ISO 15 envelope (90×125×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61918?",
        "a": "NSK lists the open 61918 under the bare designation 6918; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 90 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6918 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61918-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61918",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×125×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61918",
      "6918",
      "NSK 6918",
      "61918-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61919-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6919DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 130,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 37,
    "static_load_kN": 33.5,
    "weight_g": 601,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6919DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 61919-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61919-2RS-NSK runs slower and cooler-limited than the open 61919; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61919-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6919DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 95 mm bore 61919 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61919 at 37 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 601 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 37/33.5 kN load ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919DDU on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61919-2RS-NSK bearing?",
        "a": "A 61919-2RS-NSK deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 61919-2RS-NSK need?",
        "a": "61919-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61919 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61919 bore code work?",
        "a": "The last two digits of 61919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61919?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6919DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×130×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61919 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61919-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61919-2RS",
      "61919-2rs",
      "6919DDU",
      "NSK 6919DDU",
      "61919-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61919-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6919VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 130,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 37,
    "static_load_kN": 33.5,
    "weight_g": 601,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6919VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61919-RSR run faster than contact-seal 61919-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61919-2RS instead.",
      "The low-drag lip of 61919-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 61919-RSR and shows up later as two-point loaded raceway wear.",
      "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6919VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 95 mm bore 61919 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61919 at 37 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 601 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 37/33.5 kN load ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919VV on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61919; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61919-RSR bearing?",
        "a": "A 61919-RSR deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 61919-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61919-RSR need?",
        "a": "61919-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61919 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 61919?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6919VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×130×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61919 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61919-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61919-RSR",
      "61919-rsr",
      "6919VV",
      "NSK 6919VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61919-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6919ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 130,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 37,
    "static_load_kN": 33.5,
    "weight_g": 601,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61919-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 130 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6919ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 61919-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61919-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61919-2RS for that.",
      "Shielded 61919-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61919-ZZ.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6919ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 95 mm bore 61919 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61919 at 37 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 601 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 37/33.5 kN load ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919ZZ on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61919 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61919-ZZ bearing?",
        "a": "A 61919-ZZ deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 95 mm bore?",
        "a": "619 is a thin section one step above 618: 130×18 mm with a 17.5 mm radial section at 95 mm bore; a 6219 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61919 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61919 uses the same ISO 15 envelope (95×130×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61919?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6919ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×130×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61919 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61919-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61919-ZZ",
      "61919-zz",
      "6919ZZ",
      "NSK 6919ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61919-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6919",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 130,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 37,
    "static_load_kN": 33.5,
    "weight_g": 601,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 61919-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 95 mm bore (17.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61919-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 95×130×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61919-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 61919-NSK and shows up later as two-point loaded raceway wear.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61919-NSK.",
      "The open 61919 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 95 mm bore 61919 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61919 at 37 kN dynamic (C) and 33.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 601 g, 61919 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 95×130×18 mm envelope of 61919 gives a D/d ratio of 1.37 and only 17.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 37/33.5 kN load ratings, mass 601 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6919 on the 95×130×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61919 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61919; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61919-NSK bearing?",
        "a": "A 61919-NSK deep-groove ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61919 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61919 uses the same ISO 15 envelope (95×130×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61919-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61919-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61919 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61919?",
        "a": "NSK lists the open 61919 under the bare designation 6919; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 95 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6919 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61919-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61919-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×130×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61919",
      "6919",
      "NSK 6919",
      "61919-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61920-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6920DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 140,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47,
    "static_load_kN": 42,
    "weight_g": 828,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6920DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 100 mm of 61920-2RS demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61920-2RS runs slower and cooler-limited than the open 61920; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61920-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6920DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 100 mm bore 61920 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61920 at 47 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 828 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 47/42 kN load ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920DDU on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61920; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61920-2RS bearing?",
        "a": "A 61920-2RS deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61920-2RS have?",
        "a": "Unless a clearance suffix says otherwise, 61920-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61920 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61920-2RS be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61920?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6920DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×140×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6920DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61920-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61920-2RS",
      "61920-2rs",
      "6920DDU",
      "NSK 6920DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61920-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6920VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 140,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47,
    "static_load_kN": 42,
    "weight_g": 828,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61920-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 140 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6920VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "RSR low-friction seals on 61920-RSR run faster than contact-seal 61920-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61920-2RS instead.",
      "The low-drag lip of 61920-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 61920-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6920VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 100 mm bore 61920 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61920 at 47 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 828 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 47/42 kN load ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920VV on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61920; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61920-RSR bearing?",
        "a": "A 61920-RSR deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 61920-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 61920-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61920 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61920-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61920?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6920VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×140×20 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61920 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61920-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61920-RSR",
      "61920-rsr",
      "6920VV",
      "NSK 6920VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61920-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6920ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 140,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47,
    "static_load_kN": 42,
    "weight_g": 828,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6920ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 100 mm of 61920-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61920-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61920-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 61920-ZZ and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6920ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 100 mm bore 61920 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61920 at 47 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 828 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 47/42 kN load ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920ZZ on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61920; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61920 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61920-ZZ bearing?",
        "a": "A 61920-ZZ deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61920 bore code work?",
        "a": "The last two digits of 61920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61920-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61920?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6920ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×140×20 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61920 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61920-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61920-ZZ",
      "61920-zz",
      "6920ZZ",
      "NSK 6920ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61920-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6920",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 140,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47,
    "static_load_kN": 42,
    "weight_g": 828,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61920 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 140 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 100 mm of 61920-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (20.0 mm section height at 100 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61920-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 100×140×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61920-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61920-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61920-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61920 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 100 mm bore 61920 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61920 at 47 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 828 g, 61920 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 100×140×20 mm envelope of 61920 gives a D/d ratio of 1.40 and 20.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 47/42 kN load ratings, mass 828 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6920 on the 100×140×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61920 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61920; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61920-NSK bearing?",
        "a": "A 61920-NSK deep-groove ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61920-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61920-NSK need?",
        "a": "The open 61920-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61920?",
        "a": "NSK lists the open 61920 under the bare designation 6920; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 100 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6920?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61920-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61920",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×140×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61920",
      "6920",
      "NSK 6920",
      "61920-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61921-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6921VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 145,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 42,
    "weight_g": 856,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61921-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 145 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6921VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "RSR low-friction seals on 61921-RSR run faster than contact-seal 61921-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61921-2RS instead.",
      "The low-drag lip of 61921-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61921-RSR drags the lip and overheats it.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61921-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6921VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 105 mm bore 61921 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61921 at 46.5 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 856 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 46.5/42 kN load ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921VV on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61921; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61921-RSR bearing?",
        "a": "A 61921-RSR deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61921-RSR need?",
        "a": "61921-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61921 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61921 bore code work?",
        "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61921?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6921VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×145×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6921VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61921-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61921-RSR",
      "61921-rsr",
      "6921VV",
      "NSK 6921VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61921-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6921ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 145,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 42,
    "weight_g": 856,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6921ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 61921-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (20.0 mm section height at 105 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61921-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61921-2RS for that.",
      "Do not wash 61921-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6921ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 105 mm bore 61921 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61921 at 46.5 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 856 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 46.5/42 kN load ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921ZZ on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61921-ZZ bearing?",
        "a": "A 61921-ZZ deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61921 bore code work?",
        "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61921-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61921?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6921ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×145×20 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61921 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61921-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61921-ZZ",
      "61921-zz",
      "6921ZZ",
      "NSK 6921ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61921-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6921",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 145,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 42,
    "weight_g": 856,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61921 carries bore code 21 = 105 mm. Outside diameter 145 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 61921-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 105 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61921-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61921 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 61921-NSK drags the lip and overheats it.",
      "The open 61921 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 105 mm bore 61921 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61921 at 46.5 kN dynamic (C) and 42 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 856 g, 61921 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 105×145×20 mm envelope of 61921 gives a D/d ratio of 1.38 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 46.5/42 kN load ratings, mass 856 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6921 on the 105×145×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61921 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61921; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61921-NSK bearing?",
        "a": "A 61921-NSK deep-groove ball bearing has a 105 mm bore, 145 mm outer diameter and 20 mm width (4.134 × 5.709 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61921 bore code work?",
        "a": "The last two digits of 61921 are bore code 21, giving 21 × 5 = 105 mm bore. The 145 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61921 mean?",
        "a": "A bare 61921 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61921?",
        "a": "NSK lists the open 61921 under the bare designation 6921; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 105 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6921 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61921-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61921",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×145×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61921",
      "6921",
      "NSK 6921",
      "61921-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61922-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6922DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 150,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 44.5,
    "weight_g": 893,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61922-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 150 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6922DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Contact seals add drag and heat: 61922-2RS runs slower and cooler-limited than the open 61922; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 61922-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 61922-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the contact-sealed version as 6922DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 110 mm bore 61922 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61922 at 48 kN dynamic (C) and 44.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 893 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 48/44.5 kN load ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922DDU on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61922-2RS bearing?",
        "a": "A 61922-2RS deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61922-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61900 compare with other series at the same 110 mm bore?",
        "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61922?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6922DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×150×20 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6922DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61922-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61922-2RS",
      "61922-2rs",
      "6922DDU",
      "NSK 6922DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61922-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6922VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 150,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 44.5,
    "weight_g": 893,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6922VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 110 mm bore the ring mass is significant: heat 61922 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 110 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61922-RSR run faster than contact-seal 61922-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61922-2RS instead.",
      "The non-contact lip of 61922-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.",
      "Vibration during standstill brinells the raceways of a 110 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Measure the shaft, do not trust the drawing: a 110 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61922-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6922VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 110 mm bore 61922 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61922 at 48 kN dynamic (C) and 44.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 893 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 48/44.5 kN load ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922VV on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61922-RSR bearing?",
        "a": "A 61922-RSR deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 61900 compare with other series at the same 110 mm bore?",
        "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61922 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61922 uses the same ISO 15 envelope (110×150×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61922?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6922VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×150×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6922VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61922-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61922-RSR",
      "61922-rsr",
      "6922VV",
      "NSK 6922VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61922-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6922ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 150,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 44.5,
    "weight_g": 893,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6922ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (20.0 mm section height at 110 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61922-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61922-2RS for that.",
      "Shielded 61922-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61922-ZZ.",
      "NSK catalogues the shielded version as 6922ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 110 mm bore 61922 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61922 at 48 kN dynamic (C) and 44.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 893 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 48/44.5 kN load ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922ZZ on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61922 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61922; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61922-ZZ bearing?",
        "a": "A 61922-ZZ deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61922 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61922 uses the same ISO 15 envelope (110×150×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61922-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61922-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61922 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61922?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6922ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×150×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6922ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61922-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61922-ZZ",
      "61922-zz",
      "6922ZZ",
      "NSK 6922ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61922-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6922",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 150,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 48,
    "static_load_kN": 44.5,
    "weight_g": 893,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61922 carries bore code 22 = 110 mm. Outside diameter 150 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 110 mm of 61922-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 110 mm bore (20.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61922-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 110×150×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61922 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 61922-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61922 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 110 mm bore 61922 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61922 at 48 kN dynamic (C) and 44.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 893 g, 61922 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 110×150×20 mm envelope of 61922 gives a D/d ratio of 1.36 and only 20.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 48/44.5 kN load ratings, mass 893 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6922 on the 110×150×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61922 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61922 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61922-NSK bearing?",
        "a": "A 61922-NSK deep-groove ball bearing has a 110 mm bore, 150 mm outer diameter and 20 mm width (4.331 × 5.906 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 110 mm bore?",
        "a": "619 is a thin section one step above 618: 150×20 mm with a 20.0 mm radial section at 110 mm bore; a 6222 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61922 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61922 uses the same ISO 15 envelope (110×150×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61922?",
        "a": "NSK lists the open 61922 under the bare designation 6922; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 110 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6922?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61922-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61922-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×150×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61922",
      "6922",
      "NSK 6922",
      "61922-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61924-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6924ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 165,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 54,
    "weight_g": 1210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61924-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 165 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6924ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61924-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61924-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 61924-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6924ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 120 mm bore 61924 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61924 at 58.5 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1210 g (1.2 kg), 61924 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 58.5/54 kN load ratings, mass 1210 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6924ZZ on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61924 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61924-ZZ bearing?",
        "a": "A 61924-ZZ deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61924-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61900 compare with other series at the same 120 mm bore?",
        "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61924?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6924ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×165×22 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61924 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61924-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61924-ZZ",
      "61924-zz",
      "6924ZZ",
      "NSK 6924ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61924-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6924",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 165,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 54,
    "weight_g": 1210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61924 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 165 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 61924-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 120 mm bore (22.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61924-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 120×165×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61924 units.",
      "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61924-NSK.",
      "Vibration during standstill brinells the raceways of a 120 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 61924 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 120 mm bore 61924 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 61924 at 58.5 kN dynamic (C) and 54 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1210 g (1.2 kg), 61924 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 120×165×22 mm envelope of 61924 gives a D/d ratio of 1.38 and only 22.5 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 58.5/54 kN load ratings, mass 1210 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6924 on the 120×165×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61924 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61924; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61924-NSK bearing?",
        "a": "A 61924-NSK deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 61924 mean?",
        "a": "A bare 61924 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 61900 compare with other series at the same 120 mm bore?",
        "a": "619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK order number for an open 61924?",
        "a": "NSK lists the open 61924 under the bare designation 6924; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 120 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6924 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61924-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61924-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×165×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61924",
      "6924",
      "NSK 6924",
      "61924-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61926-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6926ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 71.5,
    "static_load_kN": 67.5,
    "weight_g": 1570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6926ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 130 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Do not wash 61926-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61926-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6926ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 130 mm bore places 61926 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 71.5 kN dynamic load rating (C) and 67.5 kN static (C0), 61926 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1570 g (1.6 kg), 61926 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 71.5/67.5 kN load ratings, mass 1570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6926ZZ on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61926; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61926 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61926-ZZ bearing?",
        "a": "A 61926-ZZ deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61926 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61926 uses the same ISO 15 envelope (130×180×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61926-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61926-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61926 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61926?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6926ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×180×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6926ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61926-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61926-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61926-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61926",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61926-ZZ",
      "61926-zz",
      "6926ZZ",
      "NSK 6926ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61926-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6926",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 71.5,
    "static_load_kN": 67.5,
    "weight_g": 1570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61926 carries bore code 26 = 130 mm. Outside diameter 180 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 130 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (25.0 mm section height at 130 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61926-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 130×180×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61926-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 61926-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61926-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 61926 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 130 mm bore places 61926 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 71.5 kN dynamic load rating (C) and 67.5 kN static (C0), 61926 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1570 g (1.6 kg), 61926 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 130×180×24 mm envelope of 61926 gives a D/d ratio of 1.38 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 71.5/67.5 kN load ratings, mass 1570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6926 on the 130×180×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61926 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61926-NSK bearing?",
        "a": "A 61926-NSK deep-groove ball bearing has a 130 mm bore, 180 mm outer diameter and 24 mm width (5.118 × 7.087 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 130 mm bore?",
        "a": "619 is a thin section one step above 618: 180×24 mm with a 25.0 mm radial section at 130 mm bore; a 6226 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61926 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61926 uses the same ISO 15 envelope (130×180×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61926?",
        "a": "NSK lists the open 61926 under the bare designation 6926; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61926 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61926-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61926-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61926-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61926",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×180×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61926",
      "6926",
      "NSK 6926",
      "61926-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61928-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6928VV",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 72,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6928VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 140 mm of 61928-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "RSR low-friction seals on 61928-RSR run faster than contact-seal 61928-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61928-2RS instead.",
      "The non-contact lip of 61928-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 140 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61928-C3. No clearance suffix means normal CN clearance.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6928VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 140 mm bore places 61928 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 73.5 kN dynamic load rating (C) and 72 kN static (C0), 61928 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1670 g (1.7 kg), 61928 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 73.5/72 kN load ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928VV on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61928 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61928; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61928-RSR bearing?",
        "a": "A 61928-RSR deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 61928-RSR need?",
        "a": "61928-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61928 with a housing grease fitting instead."
      },
      {
        "q": "How does the 61928 bore code work?",
        "a": "The last two digits of 61928 are bore code 28, giving 28 × 5 = 140 mm bore. The 190 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61928?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6928VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×190×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6928VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61928-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61928-RSR",
      "61928-rsr",
      "6928VV",
      "NSK 6928VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61928-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6928ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 72,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6928ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61928-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61928-2RS for that.",
      "Do not wash 61928-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Never mix components between two 61928-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6928ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 140 mm bore places 61928 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 73.5 kN dynamic load rating (C) and 72 kN static (C0), 61928 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1670 g (1.7 kg), 61928 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 73.5/72 kN load ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928ZZ on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61928 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61928-ZZ bearing?",
        "a": "A 61928-ZZ deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61928 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61928-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61928-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61928 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61928?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6928ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×190×24 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61928 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61928-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61928-ZZ",
      "61928-zz",
      "6928ZZ",
      "NSK 6928ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61928-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6928",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 72,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61928 carries bore code 28 = 140 mm. Outside diameter 190 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 140 mm of 61928-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 140 mm bore (25.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Storage matters for open bearings: 61928-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61928 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The housing bore for the 190 mm OD should be round within IT7; an oval bore pinches the outer ring of 61928-NSK and shows up later as two-point loaded raceway wear.",
      "The open 61928 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 140 mm bore places 61928 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 73.5 kN dynamic load rating (C) and 72 kN static (C0), 61928 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1670 g (1.7 kg), 61928 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 140×190×24 mm envelope of 61928 gives a D/d ratio of 1.36 and only 25.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 73.5/72 kN load ratings, mass 1670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6928 on the 140×190×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61928 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61928; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61928-NSK bearing?",
        "a": "A 61928-NSK deep-groove ball bearing has a 140 mm bore, 190 mm outer diameter and 24 mm width (5.512 × 7.48 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61928 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61928 uses the same ISO 15 envelope (140×190×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61928-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61928-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61928 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61928?",
        "a": "NSK lists the open 61928 under the bare designation 6928; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61928 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61928-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61928-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×190×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61928",
      "6928",
      "NSK 6928",
      "61928-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61930-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6930DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93.5,
    "static_load_kN": 90.5,
    "weight_g": 3010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6930DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 150 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Heat is the enemy of the sealed 61930-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 61930-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 210 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61930-2RS.",
      "Vibration during standstill brinells the raceways of a 150 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6930DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 150 mm bore places 61930 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 93.5 kN dynamic load rating (C) and 90.5 kN static (C0), 61930 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3010 g (3.0 kg), 61930 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93.5/90.5 kN load ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930DDU on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61930 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61930-2RS bearing?",
        "a": "A 61930-2RS deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 61930-2RS have?",
        "a": "Unless a clearance suffix says otherwise, 61930-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61930 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 61930-2RS be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 61930?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6930DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×210×28 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61930 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61930-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61930-2RS",
      "61930-2rs",
      "6930DDU",
      "NSK 6930DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61930-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6930ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93.5,
    "static_load_kN": 90.5,
    "weight_g": 3010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61930-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 210 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6930ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (30.0 mm section height at 150 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61930-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61930-2RS for that.",
      "Do not wash 61930-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6930ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 150 mm bore places 61930 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 93.5 kN dynamic load rating (C) and 90.5 kN static (C0), 61930 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3010 g (3.0 kg), 61930 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93.5/90.5 kN load ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930ZZ on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61930 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61930-ZZ bearing?",
        "a": "A 61930-ZZ deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61930 bore code work?",
        "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 61930-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 61930?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6930ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×210×28 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6930ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61930-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61930-ZZ",
      "61930-zz",
      "6930ZZ",
      "NSK 6930ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61930",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6930",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 93.5,
    "static_load_kN": 90.5,
    "weight_g": 3010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61930 carries bore code 30 = 150 mm. Outside diameter 210 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 61930 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 150 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61930 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×210×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61930 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61930-C3. No clearance suffix means normal CN clearance.",
      "The open 61930 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 150 mm bore places 61930 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 93.5 kN dynamic load rating (C) and 90.5 kN static (C0), 61930 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3010 g (3.0 kg), 61930 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 150×210×28 mm envelope of 61930 gives a D/d ratio of 1.40 and 30.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 93.5/90.5 kN load ratings, mass 3010 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6930 on the 150×210×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61930 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61930 bearing?",
        "a": "A 61930 deep-groove ball bearing has a 150 mm bore, 210 mm outer diameter and 28 mm width (5.906 × 8.268 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61930 bore code work?",
        "a": "The last two digits of 61930 are bore code 30, giving 30 × 5 = 150 mm bore. The 210 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61930 mean?",
        "a": "A bare 61930 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61930?",
        "a": "NSK lists the open 61930 under the bare designation 6930; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6930 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61930-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61930-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×210×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61930",
      "6930",
      "NSK 6930"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61932-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6932DDU",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 95.5,
    "static_load_kN": 96,
    "weight_g": 2710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6932DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 160 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "Contact seals add drag and heat: 61932-2RS runs slower and cooler-limited than the open 61932; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 61932-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61932-2RS.",
      "NSK catalogues the contact-sealed version as 6932DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 160 mm bore places 61932 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 95.5 kN dynamic load rating (C) and 96 kN static (C0), 61932 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2710 g (2.7 kg), 61932 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 95.5/96 kN load ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932DDU on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61932 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61932-2RS bearing?",
        "a": "A 61932-2RS deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 61932-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 61900 compare with other series at the same 160 mm bore?",
        "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61932?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6932DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×220×28 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6932DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61932-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61932-2RS",
      "61932-2rs",
      "6932DDU",
      "NSK 6932DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61932-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6932ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 95.5,
    "static_load_kN": 96,
    "weight_g": 2710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6932ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 61932 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (30.0 mm section height at 160 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61932-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61932-2RS for that.",
      "Do not wash 61932-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61932-C3. No clearance suffix means normal CN clearance.",
      "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6932ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 160 mm bore places 61932 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 95.5 kN dynamic load rating (C) and 96 kN static (C0), 61932 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2710 g (2.7 kg), 61932 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 95.5/96 kN load ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932ZZ on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61932-ZZ bearing?",
        "a": "A 61932-ZZ deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 61932 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61932 uses the same ISO 15 envelope (160×220×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 61932-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 61932-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61932 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 61932?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6932ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×220×28 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 61932 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61932-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61932-ZZ",
      "61932-zz",
      "6932ZZ",
      "NSK 6932ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61932-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6932",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 95.5,
    "static_load_kN": 96,
    "weight_g": 2710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61932 carries bore code 32 = 160 mm. Outside diameter 220 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 160 mm of 61932-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 160 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61932-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 160×220×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61932-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61932-NSK.",
      "The open 61932 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 160 mm bore places 61932 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 95.5 kN dynamic load rating (C) and 96 kN static (C0), 61932 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2710 g (2.7 kg), 61932 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 160×220×28 mm envelope of 61932 gives a D/d ratio of 1.38 and only 30.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 95.5/96 kN load ratings, mass 2710 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6932 on the 160×220×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61932 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61932; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61932-NSK bearing?",
        "a": "A 61932-NSK deep-groove ball bearing has a 160 mm bore, 220 mm outer diameter and 28 mm width (6.299 × 8.661 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 160 mm bore?",
        "a": "619 is a thin section one step above 618: 220×28 mm with a 30.0 mm radial section at 160 mm bore; a 6232 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61932 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61932 uses the same ISO 15 envelope (160×220×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61932?",
        "a": "NSK lists the open 61932 under the bare designation 6932; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6932?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61932-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61932-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×220×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61932",
      "6932",
      "NSK 6932",
      "61932-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61934-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6934ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 94.5,
    "static_load_kN": 97,
    "weight_g": 3340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61934-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 230 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6934ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 61934-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 170 mm bore (30.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61934-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61934-2RS for that.",
      "Shielded 61934-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61934-C3. No clearance suffix means normal CN clearance.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 230 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61934-ZZ.",
      "NSK catalogues the shielded version as 6934ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 170 mm bore places 61934 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 94.5 kN dynamic load rating (C) and 97 kN static (C0), 61934 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3340 g (3.3 kg), 61934 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 94.5/97 kN load ratings, mass 3340 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6934ZZ on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61934 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61934; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61934-ZZ bearing?",
        "a": "A 61934-ZZ deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 61934-ZZ need?",
        "a": "61934-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 61934 bore code work?",
        "a": "The last two digits of 61934 are bore code 34, giving 34 × 5 = 170 mm bore. The 230 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 61934?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6934ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×230×28 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6934ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61934-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61934-ZZ",
      "61934-zz",
      "6934ZZ",
      "NSK 6934ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61934",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6934",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 94.5,
    "static_load_kN": 97,
    "weight_g": 3340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61934 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 230 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 170 mm of 61934 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (30.0 mm section height at 170 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61934 has no lubricant retention: grease escapes and contaminants migrate straight into the 170×230×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61934 units.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 61934 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 170 mm bore places 61934 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 94.5 kN dynamic load rating (C) and 97 kN static (C0), 61934 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3340 g (3.3 kg), 61934 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 170×230×28 mm envelope of 61934 gives a D/d ratio of 1.35 and only 30.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 94.5/97 kN load ratings, mass 3340 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6934 on the 170×230×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61934 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61934 bearing?",
        "a": "A 61934 deep-groove ball bearing has a 170 mm bore, 230 mm outer diameter and 28 mm width (6.693 × 9.055 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 61934 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61934 need?",
        "a": "The open 61934 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 61934?",
        "a": "NSK lists the open 61934 under the bare designation 6934; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6934 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61934-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61934-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×230×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61934",
      "6934",
      "NSK 6934"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61936-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6936ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 131,
    "static_load_kN": 128,
    "weight_g": 4160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61936-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6936ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 180 mm of 61936-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section at 180 mm bore (35.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "ZZ shields are non-contact: 61936-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61936-2RS for that.",
      "Do not wash 61936-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Measure the shaft, do not trust the drawing: a 180 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61936-ZZ.",
      "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6936ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 180 mm bore places 61936 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 128 kN static (C0), 61936 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4160 g (4.2 kg), 61936 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 180×250×33 mm envelope of 61936 gives a D/d ratio of 1.39 and only 35.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 131/128 kN load ratings, mass 4160 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6936ZZ on the 180×250×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61936 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61936 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61936-ZZ bearing?",
        "a": "A 61936-ZZ deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 61936-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 61900 compare with other series at the same 180 mm bore?",
        "a": "619 is a thin section one step above 618: 250×33 mm with a 35.0 mm radial section at 180 mm bore; a 6236 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 61936?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6936ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 180×250×33 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6936ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61936-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61936-ZZ",
      "61936-zz",
      "6936ZZ",
      "NSK 6936ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61936-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6936",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 131,
    "static_load_kN": 128,
    "weight_g": 4160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61936 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 250 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (35.0 mm section height at 180 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61936-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 180×250×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61936 units.",
      "A 180 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 61936 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 180 mm bore places 61936 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 131 kN dynamic load rating (C) and 128 kN static (C0), 61936 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 4160 g (4.2 kg), 61936 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 180×250×33 mm envelope of 61936 gives a D/d ratio of 1.39 and only 35.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 131/128 kN load ratings, mass 4160 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6936 on the 180×250×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61936 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61936; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61936-NSK bearing?",
        "a": "A 61936-NSK deep-groove ball bearing has a 180 mm bore, 250 mm outer diameter and 33 mm width (7.087 × 9.843 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61936-NSK need?",
        "a": "The open 61936-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61936 bore code work?",
        "a": "The last two digits of 61936 are bore code 36, giving 36 × 5 = 180 mm bore. The 250 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61936?",
        "a": "NSK lists the open 61936 under the bare designation 6936; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6936?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61936-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61936-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×250×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61936",
      "6936",
      "NSK 6936",
      "61936-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61938-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6938",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 124,
    "static_load_kN": 127,
    "weight_g": 5180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61938 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 260 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 190 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (35.0 mm section height at 190 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61938-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 190×260×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61938 units.",
      "A 190 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 61938 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 190 mm bore places 61938 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "At 124 kN dynamic load rating (C) and 127 kN static (C0), 61938 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 5180 g (5.2 kg), 61938 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 190×260×33 mm envelope of 61938 gives a D/d ratio of 1.37 and only 35.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 124/127 kN load ratings, mass 5180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6938 on the 190×260×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61938 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61938; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61938-NSK bearing?",
        "a": "A 61938-NSK deep-groove ball bearing has a 190 mm bore, 260 mm outer diameter and 33 mm width (7.48 × 10.236 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 190 mm bore?",
        "a": "619 is a thin section one step above 618: 260×33 mm with a 35.0 mm radial section at 190 mm bore; a 6238 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61938 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61938 uses the same ISO 15 envelope (190×260×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 61938?",
        "a": "NSK lists the open 61938 under the bare designation 6938; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6938?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61938-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61938-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61938",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61938-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×260×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61938",
      "6938",
      "NSK 6938",
      "61938-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61940-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6940ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 158,
    "static_load_kN": 158,
    "weight_g": 7280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61940-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 280 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6940ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61940-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61940-2RS for that.",
      "Shielded 61940-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Vibration during standstill brinells the raceways of a 200 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6940ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 200 mm bore places 61940 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61940 at 158 kN dynamic (C) and 158 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7280 g (7.3 kg), 61940 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 200×280×38 mm envelope of 61940 gives a D/d ratio of 1.40 and 40.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 158/158 kN load ratings, mass 7280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6940ZZ on the 200×280×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61940 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61940-ZZ bearing?",
        "a": "A 61940-ZZ deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 200 mm bore?",
        "a": "619 is a thin section one step above 618: 280×38 mm with a 40.0 mm radial section at 200 mm bore; a 6240 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61940 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61940 uses the same ISO 15 envelope (200×280×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61940?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6940ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 200×280×38 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6940ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61940-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61940-ZZ",
      "61940-zz",
      "6940ZZ",
      "NSK 6940ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61940-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6940",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 158,
    "static_load_kN": 158,
    "weight_g": 7280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61940 carries bore code 40 = 200 mm. Outside diameter 280 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 200 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (40.0 mm section height at 200 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Storage matters for open bearings: 61940-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61940 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 38 mm-wide ring of 61940-NSK drags the lip and overheats it.",
      "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 61940 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 200 mm bore places 61940 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 61940 at 158 kN dynamic (C) and 158 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7280 g (7.3 kg), 61940 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 200×280×38 mm envelope of 61940 gives a D/d ratio of 1.40 and 40.0 mm radial section height — this NSK thin section saves space but is sensitive to misalignment and shock; confirm the housing stays round within IT7 and the shaft does not deflect past the raceway contact angle under load.",
      "The 158/158 kN load ratings, mass 7280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6940 on the 200×280×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61940 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61940-NSK bearing?",
        "a": "A 61940-NSK deep-groove ball bearing has a 200 mm bore, 280 mm outer diameter and 38 mm width (7.874 × 11.024 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 61940 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61940 uses the same ISO 15 envelope (200×280×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 61940-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 61940-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61940 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 61940?",
        "a": "NSK lists the open 61940 under the bare designation 6940; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61940 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61940-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61940-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×280×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61940",
      "6940",
      "NSK 6940",
      "61940-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61944-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6944ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 161,
    "static_load_kN": 169,
    "weight_g": 7880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "61944-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 44 by five gives the 220 mm bore; the 300 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 220 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6944ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery",
      "packaging machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 220 mm of 61944-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 619xx thin section (40.0 mm section height at 220 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "Do not wash 61944-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 61944-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61944-C3. No clearance suffix means normal CN clearance.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61944-ZZ.",
      "NSK catalogues the shielded version as 6944ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 220 mm bore places 61944 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 61944 at 161 kN dynamic (C) and 169 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7880 g (7.9 kg), 61944 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 220×300×38 mm envelope of 61944 gives a D/d ratio of 1.36 and only 40.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 161/169 kN load ratings, mass 7880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6944ZZ on the 220×300×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61944 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61944; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61944-ZZ bearing?",
        "a": "A 61944-ZZ deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 61900 compare with other series at the same 220 mm bore?",
        "a": "619 is a thin section one step above 618: 300×38 mm with a 40.0 mm radial section at 220 mm bore; a 6244 on the same bore is substantially larger and more heavily rated."
      },
      {
        "q": "Are 61944 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 61944 uses the same ISO 15 envelope (220×300×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 61944?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6944ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 220×300×38 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6944ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61944-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61944-ZZ",
      "61944-zz",
      "6944ZZ",
      "NSK 6944ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61944-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6944",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 161,
    "static_load_kN": 169,
    "weight_g": 7880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61944 carries bore code 44 = 220 mm. Outside diameter 300 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "clutch and transmission assemblies",
      "robotics and automation joints",
      "lay shafts and idler shafts",
      "textile machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore the ring mass is significant: heat 61944 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section at 220 mm bore (40.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.",
      "The open 61944-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 220×300×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61944-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 220 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 61944-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 61944 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 220 mm bore places 61944 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 61944 at 161 kN dynamic (C) and 169 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7880 g (7.9 kg), 61944 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 220×300×38 mm envelope of 61944 gives a D/d ratio of 1.36 and only 40.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 161/169 kN load ratings, mass 7880 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6944 on the 220×300×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61944 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61944-NSK bearing?",
        "a": "A 61944-NSK deep-groove ball bearing has a 220 mm bore, 300 mm outer diameter and 38 mm width (8.661 × 11.811 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 61944-NSK need?",
        "a": "The open 61944-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 61944 bore code work?",
        "a": "The last two digits of 61944 are bore code 44, giving 44 × 5 = 220 mm bore. The 300 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 61944?",
        "a": "NSK lists the open 61944 under the bare designation 6944; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61944 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61944-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61944-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×300×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61944",
      "6944",
      "NSK 6944",
      "61944-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61948-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6948ZZ",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 170,
    "static_load_kN": 190,
    "weight_g": 8490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6948ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "textile machinery",
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore the ring mass is significant: heat 61948 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "ZZ shields are non-contact: 61948-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61948-2RS for that.",
      "Shielded 61948-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61948-ZZ.",
      "Vibration during standstill brinells the raceways of a 240 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6948ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 240 mm bore places 61948 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 61948 at 170 kN dynamic (C) and 190 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8490 g (8.5 kg), 61948 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 240×320×38 mm envelope of 61948 gives a D/d ratio of 1.33 and only 40.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 170/190 kN load ratings, mass 8490 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6948ZZ on the 240×320×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61948 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61948; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61948-ZZ bearing?",
        "a": "A 61948-ZZ deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 61948-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 240 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 61948-ZZ need?",
        "a": "61948-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 61948?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6948ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 240×320×38 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6948ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61948-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61948-ZZ",
      "61948-zz",
      "6948ZZ",
      "NSK 6948ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "61948-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6948",
    "series": "61900-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 170,
    "static_load_kN": 190,
    "weight_g": 8490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61948 carries bore code 48 = 240 mm. Outside diameter 320 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "packaging machinery",
      "space-constrained gearboxes",
      "clutch and transmission assemblies",
      "robotics and automation joints"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 619xx thin section (40.0 mm section height at 240 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.",
      "The open 61948-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 240×320×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 61948-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 61948-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 240 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61948-NSK.",
      "The open 61948 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 240 mm bore places 61948 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 61948 at 170 kN dynamic (C) and 190 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8490 g (8.5 kg), 61948 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 240×320×38 mm envelope of 61948 gives a D/d ratio of 1.33 and only 40.0 mm radial section height — this is an ultra-thin section in NSK's E1103 catalogue where shaft deflection and housing ovality directly load the ball-raceway contact; verify shaft stiffness (target deflection under 0.05 mm) before specifying it over a 62-series.",
      "The 170/190 kN load ratings, mass 8490 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6948 on the 240×320×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61948 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 61948 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 61948; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 61948-NSK bearing?",
        "a": "A 61948-NSK deep-groove ball bearing has a 240 mm bore, 320 mm outer diameter and 38 mm width (9.449 × 12.598 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 61948 bore code work?",
        "a": "The last two digits of 61948 are bore code 48, giving 48 × 5 = 240 mm bore. The 320 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 61948 mean?",
        "a": "A bare 61948 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 61948?",
        "a": "NSK lists the open 61948 under the bare designation 6948; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "Does NSK offer 61948 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "61948-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "61948-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×320×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "61948",
      "6948",
      "NSK 6948",
      "61948-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6200-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6200DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.39,
    "weight_g": 32,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6200 carries bore code 10 = 10 mm. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6200DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6200 with C3 clearance and re-check the residual value after mounting.",
      "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6200-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6200-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6200-2RS-NSK.",
      "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6200DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 10 mm bore the 6200 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6200 at 5.6 kN dynamic (C) and 2.39 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 32 g, 6200 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.39 kN load ratings, mass 32 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6200DDU on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6200-2RS-NSK bearing?",
        "a": "A 6200-2RS-NSK deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6200-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6200-2RS-NSK need?",
        "a": "6200-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6200 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6200?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6200DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×30×9 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6200 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6200-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6200-2RS",
      "6200-2rs",
      "6200DDU",
      "NSK 6200DDU",
      "6200-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6200-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6200VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.39,
    "weight_g": 32,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6200 carries bore code 10 = 10 mm. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6200VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6200 with C3 clearance and re-check the residual value after mounting.",
      "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6200-RSR-NSK run faster than contact-seal 6200-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6200-2RS instead.",
      "The low-drag lip of 6200-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 9 mm-wide ring of 6200-RSR-NSK drags the lip and overheats it.",
      "NSK catalogues this low-friction non-contact seal as 6200VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 10 mm bore the 6200 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6200 at 5.6 kN dynamic (C) and 2.39 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 32 g, 6200 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.39 kN load ratings, mass 32 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6200VV on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6200; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6200-RSR-NSK bearing?",
        "a": "A 6200-RSR-NSK deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6200 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6200 uses the same ISO 15 envelope (10×30×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6200-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6200-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6200 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6200?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6200VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×30×9 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6200 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6200-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6200-RSR",
      "6200-rsr",
      "6200VV",
      "NSK 6200VV",
      "6200-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6200-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6200ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.39,
    "weight_g": 32,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6200 carries bore code 10 = 10 mm. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6200ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6200 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.",
      "Do not wash 6200-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6200-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6200-ZZ-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6200-ZZ-NSK.",
      "NSK catalogues the shielded version as 6200ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 10 mm bore the 6200 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6200 at 5.6 kN dynamic (C) and 2.39 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 32 g, 6200 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.39 kN load ratings, mass 32 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6200ZZ on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6200; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6200-ZZ-NSK bearing?",
        "a": "A 6200-ZZ-NSK deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 10 mm bore?",
        "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated."
      },
      {
        "q": "Are 6200 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6200 uses the same ISO 15 envelope (10×30×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6200?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6200ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×30×9 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6200 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6200-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6200-ZZ",
      "6200-zz",
      "6200ZZ",
      "NSK 6200ZZ",
      "6200-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6200-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6200",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 5.6,
    "static_load_kN": 2.39,
    "weight_g": 32,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6200 carries bore code 10 = 10 mm. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6200 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.",
      "The open 6200-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6200-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6200 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 10 mm bore the 6200 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6200 at 5.6 kN dynamic (C) and 2.39 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 32 g, 6200 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 5.6/2.39 kN load ratings, mass 32 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6200 on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6200; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6200 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6200-NSK bearing?",
        "a": "A 6200-NSK deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6200 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6200 uses the same ISO 15 envelope (10×30×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6200-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6200-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6200 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6200?",
        "a": "NSK lists the open 6200 under the bare designation 6200; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 10 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6200 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6200-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6200-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6200",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6200",
      "NSK 6200",
      "6200-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6201-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6201DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.5,
    "static_load_kN": 3.05,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 12 = 12 mm. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6201DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6201 with C3 clearance and re-check the residual value after mounting.",
      "At 12 mm bore the 62xx light series is the workhorse section; its 32×10 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6201-2RS-NSK runs slower and cooler-limited than the open 6201; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6201-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6201-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6201DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 12 mm bore the 6201 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6201 at 7.5 kN dynamic (C) and 3.05 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 6201 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 7.5/3.05 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6201DDU on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6201 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6201-2RS-NSK bearing?",
        "a": "A 6201-2RS-NSK deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6200 compare with other series at the same 12 mm bore?",
        "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated."
      },
      {
        "q": "Are 6201 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6201 uses the same ISO 15 envelope (12×32×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6201?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6201DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×32×10 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6201DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6201-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6201-2RS",
      "6201-2rs",
      "6201DDU",
      "NSK 6201DDU",
      "6201-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6201-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6201VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.5,
    "static_load_kN": 3.05,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6201-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6201VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6201 with C3 clearance and re-check the residual value after mounting.",
      "At 12 mm bore the 62xx light series is the workhorse section; its 32×10 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6201-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6201-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 12 mm bore position before relying on it as sealed-for-life.",
      "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6201-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 10 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6201VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 12 mm bore the 6201 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6201 at 7.5 kN dynamic (C) and 3.05 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 6201 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 7.5/3.05 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6201VV on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6201 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6201-RSR-NSK bearing?",
        "a": "A 6201-RSR-NSK deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6201 bore code work?",
        "a": "The last two digits of 6201 are bore code 12, giving 12 × 5 = 12 mm bore. The 32 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6201-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6201?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6201VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×32×10 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6201VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6201-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6201-RSR",
      "6201-rsr",
      "6201VV",
      "NSK 6201VV",
      "6201-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6201-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6201ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.5,
    "static_load_kN": 3.05,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6201-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6201ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6201 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.",
      "Do not wash 6201-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6201-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6201-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6201ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 12 mm bore the 6201 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6201 at 7.5 kN dynamic (C) and 3.05 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 6201 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 7.5/3.05 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6201ZZ on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6201; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6201-ZZ-NSK bearing?",
        "a": "A 6201-ZZ-NSK deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6201 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6201 uses the same ISO 15 envelope (12×32×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6201-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6201-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6201 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6201?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6201ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×32×10 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6201ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6201-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6201-ZZ",
      "6201-zz",
      "6201ZZ",
      "NSK 6201ZZ",
      "6201-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6201-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6201",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 7.5,
    "static_load_kN": 3.05,
    "weight_g": 37,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 12 = 12 mm. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6201 against the shaft shoulder while it cools so the ring cannot creep back.",
      "At 12 mm bore the 62xx light series is the workhorse section; its 32×10 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6201-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6201-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6201 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 12 mm bore the 6201 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6201 at 7.5 kN dynamic (C) and 3.05 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 37 g, 6201 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 7.5/3.05 kN load ratings, mass 37 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6201 on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6201-NSK bearing?",
        "a": "A 6201-NSK deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6201-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6201-NSK need?",
        "a": "The open 6201-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6201?",
        "a": "NSK lists the open 6201 under the bare designation 6201; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 12 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6201 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6201-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6201-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6201",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6201",
      "NSK 6201",
      "6201-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6202-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6202DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.4,
    "static_load_kN": 3.75,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6202 carries bore code 15 = 15 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6202DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6202 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.",
      "Contact seals add drag and heat: 6202-2RS-NSK runs slower and cooler-limited than the open 6202; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6202-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the contact-sealed version as 6202DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 15 mm bore the 6202 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6202 at 8.4 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 45 g, 6202 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.4/3.75 kN load ratings, mass 45 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6202DDU on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6202; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6202-2RS-NSK bearing?",
        "a": "A 6202-2RS-NSK deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6202-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6200 compare with other series at the same 15 mm bore?",
        "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6202?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6202DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×35×11 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6202DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6202-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6202-2RS",
      "6202-2rs",
      "6202DDU",
      "NSK 6202DDU",
      "6202-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6202-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6202VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.4,
    "static_load_kN": 3.75,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6202-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6202VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6202 with C3 clearance and re-check the residual value after mounting.",
      "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6202-RSR-NSK run faster than contact-seal 6202-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6202-2RS instead.",
      "The low-drag lip of 6202-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 6202-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6202-RSR-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6202VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 15 mm bore the 6202 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6202 at 8.4 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 45 g, 6202 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.4/3.75 kN load ratings, mass 45 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6202VV on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6202; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6202-RSR-NSK bearing?",
        "a": "A 6202-RSR-NSK deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6202-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6200 compare with other series at the same 15 mm bore?",
        "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6202?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6202VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×35×11 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6202 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6202-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6202-RSR",
      "6202-rsr",
      "6202VV",
      "NSK 6202VV",
      "6202-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6202-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6202ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.4,
    "static_load_kN": 3.75,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6202 carries bore code 15 = 15 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6202ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6202 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6202-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6202-2RS for that.",
      "Shielded 6202-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 11 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6202ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 15 mm bore the 6202 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6202 at 8.4 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 45 g, 6202 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.4/3.75 kN load ratings, mass 45 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6202ZZ on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6202-ZZ-NSK bearing?",
        "a": "A 6202-ZZ-NSK deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6202-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6202-ZZ-NSK need?",
        "a": "6202-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6202?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6202ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×35×11 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6202 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6202-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6202-ZZ",
      "6202-zz",
      "6202ZZ",
      "NSK 6202ZZ",
      "6202-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6202-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6202",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.4,
    "static_load_kN": 3.75,
    "weight_g": 45,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6202 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6202 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6202-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6202 units.",
      "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6202-NSK.",
      "Never mix components between two 6202-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6202 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 15 mm bore the 6202 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6202 at 8.4 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At only 45 g, 6202 is a lightweight NSK bearing that can be handled by hand; still, press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.",
      "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.4/3.75 kN load ratings, mass 45 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6202 on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6202 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6202-NSK bearing?",
        "a": "A 6202-NSK deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6202-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6202-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6202 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6202-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6202?",
        "a": "NSK lists the open 6202 under the bare designation 6202; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 15 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6202 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6202-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6202-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6202",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6202",
      "NSK 6202",
      "6202-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6203-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6203DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.5,
    "static_load_kN": 4.8,
    "weight_g": 67,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6203-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6203DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Heat is the enemy of the sealed 6203-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6203-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6203DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 17 mm bore the 6203 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6203 at 10.5 kN dynamic (C) and 4.8 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 67 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.5/4.8 kN load ratings, mass 67 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6203DDU on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6203 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6203-2RS-NSK bearing?",
        "a": "A 6203-2RS-NSK deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6200 compare with other series at the same 17 mm bore?",
        "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated."
      },
      {
        "q": "Are 6203 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6203 uses the same ISO 15 envelope (17×40×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6203?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6203DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×40×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6203DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6203-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6203-2RS",
      "6203-2rs",
      "6203DDU",
      "NSK 6203DDU",
      "6203-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6203-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6203VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.5,
    "static_load_kN": 4.8,
    "weight_g": 67,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6203-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6203VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "RSR low-friction seals on 6203-RSR-NSK run faster than contact-seal 6203-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6203-2RS instead.",
      "The low-drag lip of 6203-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6203VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 17 mm bore the 6203 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6203 at 10.5 kN dynamic (C) and 4.8 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 67 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.5/4.8 kN load ratings, mass 67 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6203VV on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6203-RSR-NSK bearing?",
        "a": "A 6203-RSR-NSK deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6203-RSR-NSK need?",
        "a": "6203-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6203 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6203 bore code work?",
        "a": "The last two digits of 6203 are bore code 17, giving 17 × 5 = 17 mm bore. The 40 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6203?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6203VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×40×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6203VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6203-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6203-RSR",
      "6203-rsr",
      "6203VV",
      "NSK 6203VV",
      "6203-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6203-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6203ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.5,
    "static_load_kN": 4.8,
    "weight_g": 67,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6203 carries bore code 17 = 17 mm. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6203ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Do not wash 6203-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6203-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Never mix components between two 6203-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6203ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 17 mm bore the 6203 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6203 at 10.5 kN dynamic (C) and 4.8 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 67 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.5/4.8 kN load ratings, mass 67 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6203ZZ on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6203; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6203-ZZ-NSK bearing?",
        "a": "A 6203-ZZ-NSK deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6203-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6203-ZZ-NSK need?",
        "a": "6203-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6203?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6203ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×40×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6203ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6203-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6203-ZZ",
      "6203-zz",
      "6203ZZ",
      "NSK 6203ZZ",
      "6203-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6203-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6203",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.5,
    "static_load_kN": 4.8,
    "weight_g": 67,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6203 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 6203-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.",
      "The open 6203-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6203-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6203-NSK-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6203-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6203 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 17 mm bore the 6203 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6203 at 10.5 kN dynamic (C) and 4.8 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 67 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.5/4.8 kN load ratings, mass 67 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6203 on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6203; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6203-NSK bearing?",
        "a": "A 6203-NSK deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6203-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6203-NSK need?",
        "a": "The open 6203-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6203?",
        "a": "NSK lists the open 6203 under the bare designation 6203; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 17 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6203 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6203-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6203-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6203",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6203",
      "NSK 6203",
      "6203-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6204DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.1,
    "static_load_kN": 6.6,
    "weight_g": 107,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6204DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6204 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Heat is the enemy of the sealed 6204-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6204-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the contact-sealed version as 6204DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 20 mm bore puts 6204 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6204 at 14.1 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 107 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.1/6.6 kN load ratings, mass 107 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6204DDU on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6204 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-2RS-NSK bearing?",
        "a": "A 6204-2RS-NSK deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6204-2RS-NSK need?",
        "a": "6204-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6204 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6204 bore code work?",
        "a": "The last two digits of 6204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6204?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6204DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×47×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6204DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204-2RS",
      "6204-2rs",
      "6204DDU",
      "NSK 6204DDU",
      "6204-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6204VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.1,
    "static_load_kN": 6.6,
    "weight_g": 107,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6204-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6204VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-RSR-NSK.",
      "At 20 mm bore the 62xx light series is the workhorse section; its 47×14 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6204-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6204-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6204VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 20 mm bore puts 6204 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6204 at 14.1 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 107 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.1/6.6 kN load ratings, mass 107 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6204VV on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-RSR-NSK bearing?",
        "a": "A 6204-RSR-NSK deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6204-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6204-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6204-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 20 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6204?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6204VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×47×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6204VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204-RSR",
      "6204-rsr",
      "6204VV",
      "NSK 6204VV",
      "6204-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6204ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.1,
    "static_load_kN": 6.6,
    "weight_g": 107,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6204-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6204ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6204 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.",
      "Do not wash 6204-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6204-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6204-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6204ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 20 mm bore puts 6204 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6204 at 14.1 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 107 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.1/6.6 kN load ratings, mass 107 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6204ZZ on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-ZZ-NSK bearing?",
        "a": "A 6204-ZZ-NSK deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6204 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6204-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6204-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6204 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6204?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6204ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×47×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6204ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204-ZZ",
      "6204-zz",
      "6204ZZ",
      "NSK 6204ZZ",
      "6204-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6204-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6204",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 14.1,
    "static_load_kN": 6.6,
    "weight_g": 107,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6204 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6204-NSK.",
      "The 62xx light series is the default general-purpose section at 20 mm bore; before upgrading to a 6304 for extra capacity, confirm the housing accepts a 47 mm OD and 14 mm width — it is not a drop-in swap.",
      "The open 6204-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6204 units.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Vibration during standstill brinells the raceways of a 20 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6204 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 20 mm bore puts 6204 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6204 at 14.1 kN dynamic (C) and 6.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 107 g, 6204 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×47×14 mm envelope of 6204 gives a D/d ratio of 2.35 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 14.1/6.6 kN load ratings, mass 107 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6204 on the 20×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6204 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6204-NSK bearing?",
        "a": "A 6204-NSK deep-groove ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 20 mm bore?",
        "a": "The '2' is the light diameter series: 47×14 mm with a 13.5 mm radial section at 20 mm bore. A 6304 on the same bore is larger and higher-rated; a 6004 is smaller and lower-rated."
      },
      {
        "q": "Are 6204 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6204 uses the same ISO 15 envelope (20×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6204?",
        "a": "NSK lists the open 6204 under the bare designation 6204; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6204 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6204",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6204",
      "NSK 6204",
      "6204-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6205DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.4,
    "static_load_kN": 7.85,
    "weight_g": 129,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6205-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6205DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6205 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.",
      "Contact seals add drag and heat: 6205-2RS-NSK runs slower and cooler-limited than the open 6205; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6205-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6205DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 25 mm bore puts 6205 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.4 kN dynamic load rating (C) and 7.85 kN static (C0), 6205 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 129 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.4/7.85 kN load ratings, mass 129 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6205DDU on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-2RS-NSK bearing?",
        "a": "A 6205-2RS-NSK deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6205-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6205-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6205 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6205-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6205?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6205DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6205 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205-2RS",
      "6205-2rs",
      "6205DDU",
      "NSK 6205DDU",
      "6205-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6205VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.4,
    "static_load_kN": 7.85,
    "weight_g": 129,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6205-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6205VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6205 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 25 mm bore; before upgrading to a 6305 for extra capacity, confirm the housing accepts a 52 mm OD and 15 mm width — it is not a drop-in swap.",
      "The low-drag lip of 6205-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6205-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6205-RSR-NSK.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6205VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 25 mm bore puts 6205 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.4 kN dynamic load rating (C) and 7.85 kN static (C0), 6205 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 129 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.4/7.85 kN load ratings, mass 129 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6205VV on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-RSR-NSK bearing?",
        "a": "A 6205-RSR-NSK deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6200 compare with other series at the same 25 mm bore?",
        "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated."
      },
      {
        "q": "Are 6205 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6205 uses the same ISO 15 envelope (25×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6205?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6205VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6205VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205-RSR",
      "6205-rsr",
      "6205VV",
      "NSK 6205VV",
      "6205-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6205ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.4,
    "static_load_kN": 7.85,
    "weight_g": 129,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6205-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 05 by five gives the 25 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 25 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6205ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6205 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 25 mm bore the 62xx light series is the workhorse section; its 52×15 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Do not wash 6205-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6205-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6205-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 6205-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6205ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 25 mm bore puts 6205 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.4 kN dynamic load rating (C) and 7.85 kN static (C0), 6205 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 129 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.4/7.85 kN load ratings, mass 129 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6205ZZ on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-ZZ-NSK bearing?",
        "a": "A 6205-ZZ-NSK deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6205-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6200 compare with other series at the same 25 mm bore?",
        "a": "The '2' is the light diameter series: 52×15 mm with a 13.5 mm radial section at 25 mm bore. A 6305 on the same bore is larger and higher-rated; a 6005 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6205?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6205ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6205ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205-ZZ",
      "6205-zz",
      "6205ZZ",
      "NSK 6205ZZ",
      "6205-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6205-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6205",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15.4,
    "static_load_kN": 7.85,
    "weight_g": 129,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6205 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 25 mm bore the 62xx light series is the workhorse section; its 52×15 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6205-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6205 units.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6205 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 25 mm bore puts 6205 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 15.4 kN dynamic load rating (C) and 7.85 kN static (C0), 6205 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 129 g, 6205 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 25×52×15 mm envelope of 6205 gives a D/d ratio of 2.08 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15.4/7.85 kN load ratings, mass 129 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6205 on the 25×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6205 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6205; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6205-NSK bearing?",
        "a": "A 6205-NSK deep-groove ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6205-NSK need?",
        "a": "The open 6205-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6205 bore code work?",
        "a": "The last two digits of 6205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6205?",
        "a": "NSK lists the open 6205 under the bare designation 6205; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6205 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6205",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6205",
      "NSK 6205",
      "6205-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6206DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 11.3,
    "weight_g": 199,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6206DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Heat is the enemy of the sealed 6206-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6206-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6206DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 30 mm bore puts 6206 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 21.4 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 199 g, 6206 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 21.4/11.3 kN load ratings, mass 199 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6206DDU on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-2RS-NSK bearing?",
        "a": "A 6206-2RS-NSK deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6206-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6200 compare with other series at the same 30 mm bore?",
        "a": "The '2' is the light diameter series: 62×16 mm with a 16.0 mm radial section at 30 mm bore. A 6306 on the same bore is larger and higher-rated; a 6006 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6206?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6206DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×62×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6206 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206-2RS",
      "6206-2rs",
      "6206DDU",
      "NSK 6206DDU",
      "6206-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6206VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 11.3,
    "weight_g": 199,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6206-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 62 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6206VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6206-RSR-NSK.",
      "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6206-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6206-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6206VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 30 mm bore puts 6206 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 21.4 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 199 g, 6206 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 21.4/11.3 kN load ratings, mass 199 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6206VV on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-RSR-NSK bearing?",
        "a": "A 6206-RSR-NSK deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6206 bore code work?",
        "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6206-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6206?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6206VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×62×16 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6206 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206-RSR",
      "6206-rsr",
      "6206VV",
      "NSK 6206VV",
      "6206-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6206ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 11.3,
    "weight_g": 199,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6206ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6206-ZZ-NSK.",
      "The 62xx light series is the default general-purpose section at 30 mm bore; before upgrading to a 6306 for extra capacity, confirm the housing accepts a 62 mm OD and 16 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6206-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6206-2RS for that.",
      "Do not wash 6206-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6206-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6206ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 30 mm bore puts 6206 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 21.4 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 199 g, 6206 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 21.4/11.3 kN load ratings, mass 199 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6206ZZ on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6206; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-ZZ-NSK bearing?",
        "a": "A 6206-ZZ-NSK deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6206 bore code work?",
        "a": "The last two digits of 6206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6206-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6206?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6206ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×62×16 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6206ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206-ZZ",
      "6206-zz",
      "6206ZZ",
      "NSK 6206ZZ",
      "6206-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6206-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6206",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 11.3,
    "weight_g": 199,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6206 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 62 mm outside diameter and 16 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6206 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 30 mm bore the 62xx light series is the workhorse section; its 62×16 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6206-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6206-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 62 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6206-NSK.",
      "The open 6206 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 30 mm bore puts 6206 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 21.4 kN dynamic load rating (C) and 11.3 kN static (C0), 6206 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 199 g, 6206 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 30×62×16 mm envelope of 6206 gives a D/d ratio of 2.07 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 21.4/11.3 kN load ratings, mass 199 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6206 on the 30×62×16 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6206 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6206 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6206-NSK bearing?",
        "a": "A 6206-NSK deep-groove ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6206-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6206-NSK need?",
        "a": "The open 6206-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6206?",
        "a": "NSK lists the open 6206 under the bare designation 6206; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6206 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "206-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×16 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6206",
      "NSK 6206",
      "6206-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6207DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 28.2,
    "static_load_kN": 15.3,
    "weight_g": 284,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6207-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 72 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6207DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6207 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 35 mm bore the 62xx light series is the workhorse section; its 72×17 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6207-2RS-NSK runs slower and cooler-limited than the open 6207; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6207-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 6207-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6207DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 35 mm bore puts 6207 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 28.2 kN dynamic load rating (C) and 15.3 kN static (C0), 6207 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 284 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28.2/15.3 kN load ratings, mass 284 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6207DDU on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6207 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6207; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-2RS-NSK bearing?",
        "a": "A 6207-2RS-NSK deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6207-2RS-NSK need?",
        "a": "6207-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6207 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6207 bore code work?",
        "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6207?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6207DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×72×17 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6207 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207-2RS",
      "6207-2rs",
      "6207DDU",
      "NSK 6207DDU",
      "6207-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6207VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 28.2,
    "static_load_kN": 15.3,
    "weight_g": 284,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6207VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6207-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6207-RSR run faster than contact-seal 6207-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6207-2RS instead.",
      "The low-drag lip of 6207-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 6207-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6207-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6207VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 35 mm bore puts 6207 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 28.2 kN dynamic load rating (C) and 15.3 kN static (C0), 6207 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 284 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28.2/15.3 kN load ratings, mass 284 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6207VV on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6207; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-RSR bearing?",
        "a": "A 6207-RSR deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6207 bore code work?",
        "a": "The last two digits of 6207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6207-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6207?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6207VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×72×17 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6207VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207-RSR",
      "6207-rsr",
      "6207VV",
      "NSK 6207VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6207ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 28.2,
    "static_load_kN": 15.3,
    "weight_g": 284,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6207-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 72 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6207ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6207 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 35 mm bore; before upgrading to a 6307 for extra capacity, confirm the housing accepts a 72 mm OD and 17 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6207-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6207-2RS for that.",
      "Do not wash 6207-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6207-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6207ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 35 mm bore puts 6207 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 28.2 kN dynamic load rating (C) and 15.3 kN static (C0), 6207 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 284 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28.2/15.3 kN load ratings, mass 284 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6207ZZ on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-ZZ-NSK bearing?",
        "a": "A 6207-ZZ-NSK deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6207-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6207-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6207 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6207-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6207?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6207ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×72×17 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6207 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207-ZZ",
      "6207-zz",
      "6207ZZ",
      "NSK 6207ZZ",
      "6207-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6207-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6207",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 28.2,
    "static_load_kN": 15.3,
    "weight_g": 284,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6207 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 72 mm outside diameter and 17 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6207-NSK.",
      "At 35 mm bore the 62xx light series is the workhorse section; its 72×17 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6207-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6207-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 17 mm-wide ring of 6207-NSK drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6207-NSK.",
      "The open 6207 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 35 mm bore puts 6207 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 28.2 kN dynamic load rating (C) and 15.3 kN static (C0), 6207 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 284 g, 6207 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×72×17 mm envelope of 6207 gives a D/d ratio of 2.06 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 28.2/15.3 kN load ratings, mass 284 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6207 on the 35×72×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6207 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6207 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6207-NSK bearing?",
        "a": "A 6207-NSK deep-groove ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6207 mean?",
        "a": "A bare 6207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 35 mm bore?",
        "a": "The '2' is the light diameter series: 72×17 mm with an 18.5 mm radial section at 35 mm bore. A 6307 on the same bore is larger and higher-rated; a 6007 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6207?",
        "a": "NSK lists the open 6207 under the bare designation 6207; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6207 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "207-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6207",
      "NSK 6207",
      "6207-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6208DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 17.9,
    "weight_g": 366,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6208DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6208-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6208-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 40 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6208DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 40 mm bore puts 6208 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 32 kN dynamic load rating (C) and 17.9 kN static (C0), 6208 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 366 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/17.9 kN load ratings, mass 366 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6208DDU on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-2RS-NSK bearing?",
        "a": "A 6208-2RS-NSK deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6208 bore code work?",
        "a": "The last two digits of 6208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6208-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6208?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6208DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×80×18 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6208 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208-2RS",
      "6208-2rs",
      "6208DDU",
      "NSK 6208DDU",
      "6208-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6208VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 17.9,
    "weight_g": 366,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6208-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 80 mm outside diameter and 18 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6208VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6208-RSR-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6208-RSR-NSK run faster than contact-seal 6208-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6208-2RS instead.",
      "The low-drag lip of 6208-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6208-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6208VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 40 mm bore puts 6208 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 32 kN dynamic load rating (C) and 17.9 kN static (C0), 6208 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 366 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/17.9 kN load ratings, mass 366 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6208VV on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6208; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-RSR-NSK bearing?",
        "a": "A 6208-RSR-NSK deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6208-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6208-RSR-NSK need?",
        "a": "6208-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6208 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6208?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6208VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×80×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6208VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208-RSR",
      "6208-rsr",
      "6208VV",
      "NSK 6208VV",
      "6208-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6208ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 17.9,
    "weight_g": 366,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6208ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6208-ZZ-NSK.",
      "At 40 mm bore the 62xx light series is the workhorse section; its 80×18 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Do not wash 6208-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6208-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6208-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6208ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 40 mm bore puts 6208 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 32 kN dynamic load rating (C) and 17.9 kN static (C0), 6208 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 366 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/17.9 kN load ratings, mass 366 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6208ZZ on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-ZZ-NSK bearing?",
        "a": "A 6208-ZZ-NSK deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6208-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6200 compare with other series at the same 40 mm bore?",
        "a": "The '2' is the light diameter series: 80×18 mm with a 20.0 mm radial section at 40 mm bore. A 6308 on the same bore is larger and higher-rated; a 6008 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6208?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6208ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×80×18 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6208ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208-ZZ",
      "6208-zz",
      "6208ZZ",
      "NSK 6208ZZ",
      "6208-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6208-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6208",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 32,
    "static_load_kN": 17.9,
    "weight_g": 366,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6208-NSK.",
      "The 62xx light series is the default general-purpose section at 40 mm bore; before upgrading to a 6308 for extra capacity, confirm the housing accepts a 80 mm OD and 18 mm width — it is not a drop-in swap.",
      "The open 6208-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6208-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6208 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 40 mm bore puts 6208 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 32 kN dynamic load rating (C) and 17.9 kN static (C0), 6208 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 366 g, 6208 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×80×18 mm envelope of 6208 gives a D/d ratio of 2.00 and 20.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 32/17.9 kN load ratings, mass 366 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6208 on the 40×80×18 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6208 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6208 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6208-NSK bearing?",
        "a": "A 6208-NSK deep-groove ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6208 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6208 uses the same ISO 15 envelope (40×80×18 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6208-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6208-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6208 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6208?",
        "a": "NSK lists the open 6208 under the bare designation 6208; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6208 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6208-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "208-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6208",
      "NSK 6208",
      "6208-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6209-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6209DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 20.4,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6209DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6209 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6209-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6209-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 6209-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6209DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 45 mm bore puts 6209 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 34.5 kN dynamic load rating (C) and 20.4 kN static (C0), 6209 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 420 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 34.5/20.4 kN load ratings, mass 420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6209DDU on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6209-2RS-NSK bearing?",
        "a": "A 6209-2RS-NSK deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6209-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6209-2RS-NSK need?",
        "a": "6209-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6209 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6209?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6209DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×85×19 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6209DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6209-2RS",
      "6209-2rs",
      "6209DDU",
      "NSK 6209DDU",
      "6209-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6209-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6209VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 20.4,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6209VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6209 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 62xx light series is the default general-purpose section at 45 mm bore; before upgrading to a 6309 for extra capacity, confirm the housing accepts a 85 mm OD and 19 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6209-RSR run faster than contact-seal 6209-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6209-2RS instead.",
      "The non-contact lip of 6209-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6209VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 45 mm bore puts 6209 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 34.5 kN dynamic load rating (C) and 20.4 kN static (C0), 6209 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 420 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 34.5/20.4 kN load ratings, mass 420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6209VV on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6209 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6209; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6209-RSR bearing?",
        "a": "A 6209-RSR deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6209-RSR need?",
        "a": "6209-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6209 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6209 bore code work?",
        "a": "The last two digits of 6209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6209?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6209VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×85×19 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6209VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6209-RSR",
      "6209-rsr",
      "6209VV",
      "NSK 6209VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6209-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6209ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 20.4,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6209ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6209 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6209-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6209-2RS for that.",
      "Do not wash 6209-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6209-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6209ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 45 mm bore puts 6209 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 34.5 kN dynamic load rating (C) and 20.4 kN static (C0), 6209 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 420 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 34.5/20.4 kN load ratings, mass 420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6209ZZ on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6209-ZZ-NSK bearing?",
        "a": "A 6209-ZZ-NSK deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6209-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6209-ZZ-NSK need?",
        "a": "6209-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6209?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6209ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×85×19 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6209ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6209-ZZ",
      "6209-zz",
      "6209ZZ",
      "NSK 6209ZZ",
      "6209-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6209-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6209",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 20.4,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6209 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 85 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6209 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "At 45 mm bore the 62xx light series is the workhorse section; its 85×19 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6209-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6209 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 19 mm-wide ring of 6209-NSK drags the lip and overheats it.",
      "The open 6209 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 45 mm bore puts 6209 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 34.5 kN dynamic load rating (C) and 20.4 kN static (C0), 6209 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 420 g, 6209 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×85×19 mm envelope of 6209 gives a D/d ratio of 1.89 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 34.5/20.4 kN load ratings, mass 420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6209 on the 45×85×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6209 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6209; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6209 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6209-NSK bearing?",
        "a": "A 6209-NSK deep-groove ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6209 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6209 uses the same ISO 15 envelope (45×85×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6209-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6209-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6209 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6209?",
        "a": "NSK lists the open 6209 under the bare designation 6209; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 45 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6209?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6209-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "209-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6209",
      "NSK 6209",
      "6209-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6210-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6210DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 23.2,
    "weight_g": 459,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6210-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6210DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.",
      "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.",
      "Contact seals add drag and heat: 6210-2RS-NSK runs slower and cooler-limited than the open 6210; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6210-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6210-2RS-NSK.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6210-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6210DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 50 mm bore puts 6210 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6210 at 38.5 kN dynamic (C) and 23.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 459 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 38.5/23.2 kN load ratings, mass 459 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6210DDU on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6210-2RS-NSK bearing?",
        "a": "A 6210-2RS-NSK deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6210-2RS-NSK need?",
        "a": "6210-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6210 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6210 bore code work?",
        "a": "The last two digits of 6210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6210?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6210DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×90×20 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6210 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6210-2RS",
      "6210-2rs",
      "6210DDU",
      "NSK 6210DDU",
      "6210-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6210-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6210VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 23.2,
    "weight_g": 459,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6210-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6210VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6210 against the shaft shoulder while it cools so the ring cannot creep back.",
      "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "RSR low-friction seals on 6210-RSR run faster than contact-seal 6210-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6210-2RS instead.",
      "The low-drag lip of 6210-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6210-RSR.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6210-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6210VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 50 mm bore puts 6210 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6210 at 38.5 kN dynamic (C) and 23.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 459 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 38.5/23.2 kN load ratings, mass 459 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6210VV on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6210-RSR bearing?",
        "a": "A 6210-RSR deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6210-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6200 compare with other series at the same 50 mm bore?",
        "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6210?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6210VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×90×20 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6210VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6210-RSR",
      "6210-rsr",
      "6210VV",
      "NSK 6210VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6210-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6210ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 23.2,
    "weight_g": 459,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6210-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6210ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6210 with C3 clearance and re-check the residual value after mounting.",
      "At 50 mm bore the 62xx light series is the workhorse section; its 90×20 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6210-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6210-2RS for that.",
      "Shielded 6210-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6210-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 20 mm-wide ring of 6210-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6210ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 50 mm bore puts 6210 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6210 at 38.5 kN dynamic (C) and 23.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 459 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 38.5/23.2 kN load ratings, mass 459 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6210ZZ on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6210-ZZ-NSK bearing?",
        "a": "A 6210-ZZ-NSK deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6210 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6210 uses the same ISO 15 envelope (50×90×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6210-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6210-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6210 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6210?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6210ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×90×20 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6210 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6210-ZZ",
      "6210-zz",
      "6210ZZ",
      "NSK 6210ZZ",
      "6210-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6210-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6210",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 23.2,
    "weight_g": 459,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6210 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 90 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6210 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 50 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 90 mm OD and 20 mm width — it is not a drop-in swap.",
      "The open 6210-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6210 units.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6210-NSK.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6210 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 50 mm bore puts 6210 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6210 at 38.5 kN dynamic (C) and 23.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 459 g, 6210 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 50×90×20 mm envelope of 6210 gives a D/d ratio of 1.80 and 20.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 38.5/23.2 kN load ratings, mass 459 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6210 on the 50×90×20 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6210 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6210-NSK bearing?",
        "a": "A 6210-NSK deep-groove ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 50 mm bore?",
        "a": "The '2' is the light diameter series: 90×20 mm with a 20.0 mm radial section at 50 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated."
      },
      {
        "q": "Are 6210 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6210 uses the same ISO 15 envelope (50×90×20 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6210?",
        "a": "NSK lists the open 6210 under the bare designation 6210; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 50 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6210 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6210-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6210-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "210-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6210",
      "NSK 6210",
      "6210-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6211DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47.5,
    "static_load_kN": 29.3,
    "weight_g": 619,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6211DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6211 with C3 clearance and re-check the residual value after mounting.",
      "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6211-2RS-NSK runs slower and cooler-limited than the open 6211; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6211-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6211DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 55 mm bore 6211 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6211 at 47.5 kN dynamic (C) and 29.3 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 619 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 47.5/29.3 kN load ratings, mass 619 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6211DDU on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6211; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-2RS-NSK bearing?",
        "a": "A 6211-2RS-NSK deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6211-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6200 compare with other series at the same 55 mm bore?",
        "a": "The '2' is the light diameter series: 100×21 mm with a 22.5 mm radial section at 55 mm bore. A 6311 on the same bore is larger and higher-rated; a 6011 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6211?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6211DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×100×21 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6211DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211-2RS",
      "6211-2rs",
      "6211DDU",
      "NSK 6211DDU",
      "6211-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6211VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47.5,
    "static_load_kN": 29.3,
    "weight_g": 619,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6211-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6211VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6211 with C3 clearance and re-check the residual value after mounting.",
      "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6211-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6211-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 55 mm bore position before relying on it as sealed-for-life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 100 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6211-RSR.",
      "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6211-RSR and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6211VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 55 mm bore 6211 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6211 at 47.5 kN dynamic (C) and 29.3 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 619 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 47.5/29.3 kN load ratings, mass 619 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6211VV on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-RSR bearing?",
        "a": "A 6211-RSR deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6211-RSR need?",
        "a": "6211-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6211 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6211 bore code work?",
        "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6211?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6211VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×100×21 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6211 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211-RSR",
      "6211-rsr",
      "6211VV",
      "NSK 6211VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6211ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47.5,
    "static_load_kN": 29.3,
    "weight_g": 619,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6211-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 100 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6211ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6211 against the shaft shoulder while it cools so the ring cannot creep back.",
      "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6211-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6211-2RS for that.",
      "Shielded 6211-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6211-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6211-ZZ-NSK.",
      "NSK catalogues the shielded version as 6211ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 55 mm bore 6211 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6211 at 47.5 kN dynamic (C) and 29.3 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 619 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 47.5/29.3 kN load ratings, mass 619 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6211ZZ on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-ZZ-NSK bearing?",
        "a": "A 6211-ZZ-NSK deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6211-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6211-ZZ-NSK need?",
        "a": "6211-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6211?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6211ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×100×21 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6211ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211-ZZ",
      "6211-zz",
      "6211ZZ",
      "NSK 6211ZZ",
      "6211-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6211-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6211",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 47.5,
    "static_load_kN": 29.3,
    "weight_g": 619,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6211 with C3 for those conditions.",
      "At 55 mm bore the 62xx light series is the workhorse section; its 100×21 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6211-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6211 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6211-NSK drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 55 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6211 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 55 mm bore 6211 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6211 at 47.5 kN dynamic (C) and 29.3 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 619 g, 6211 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 55×100×21 mm envelope of 6211 gives a D/d ratio of 1.82 and 22.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 47.5/29.3 kN load ratings, mass 619 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6211 on the 55×100×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6211 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6211-NSK bearing?",
        "a": "A 6211-NSK deep-groove ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6211-NSK need?",
        "a": "The open 6211-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6211 bore code work?",
        "a": "The last two digits of 6211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6211?",
        "a": "NSK lists the open 6211 under the bare designation 6211; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6211 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6211-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6211-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "211-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6211",
      "NSK 6211",
      "6211-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6212-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6212DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 36,
    "weight_g": 783,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6212DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6212 with C3 clearance and re-check the residual value after mounting.",
      "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6212-2RS-NSK runs slower and cooler-limited than the open 6212; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6212-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 22 mm-wide ring of 6212-2RS-NSK drags the lip and overheats it.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6212DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 60 mm bore 6212 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6212 at 57.5 kN dynamic (C) and 36 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 57.5/36 kN load ratings, mass 783 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6212DDU on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6212-2RS-NSK bearing?",
        "a": "A 6212-2RS-NSK deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6212-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6212-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6212 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6212-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6212?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6212DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×110×22 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6212DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6212-2RS",
      "6212-2rs",
      "6212DDU",
      "NSK 6212DDU",
      "6212-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6212-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6212VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 36,
    "weight_g": 783,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6212-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 110 mm outside diameter and 22 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6212VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6212 with C3 clearance and re-check the residual value after mounting.",
      "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6212-RSR run faster than contact-seal 6212-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6212-2RS instead.",
      "The non-contact lip of 6212-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6212-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6212VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 60 mm bore 6212 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6212 at 57.5 kN dynamic (C) and 36 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 57.5/36 kN load ratings, mass 783 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6212VV on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6212-RSR bearing?",
        "a": "A 6212-RSR deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6212 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6212-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6212-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6212 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6212?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6212VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×110×22 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6212 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6212-RSR",
      "6212-rsr",
      "6212VV",
      "NSK 6212VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6212-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6212ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 36,
    "weight_g": 783,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6212ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6212 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 60 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 110 mm OD and 22 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6212-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6212-2RS for that.",
      "Do not wash 6212-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Never mix components between two 6212-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6212ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 60 mm bore 6212 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6212 at 57.5 kN dynamic (C) and 36 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 57.5/36 kN load ratings, mass 783 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6212ZZ on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6212; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6212-ZZ-NSK bearing?",
        "a": "A 6212-ZZ-NSK deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6212 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6212 uses the same ISO 15 envelope (60×110×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6212-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6212-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6212 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6212?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6212ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×110×22 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6212 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6212-ZZ",
      "6212-zz",
      "6212ZZ",
      "NSK 6212ZZ",
      "6212-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6212-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6212",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 36,
    "weight_g": 783,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6212 against the shaft shoulder while it cools so the ring cannot creep back.",
      "At 60 mm bore the 62xx light series is the workhorse section; its 110×22 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6212-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6212-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "The housing bore for the 110 mm OD should be round within IT7; an oval bore pinches the outer ring of 6212-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6212 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 60 mm bore 6212 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6212 at 57.5 kN dynamic (C) and 36 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 783 g, 6212 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 60×110×22 mm envelope of 6212 gives a D/d ratio of 1.83 and 25.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 57.5/36 kN load ratings, mass 783 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6212 on the 60×110×22 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6212 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6212; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6212-NSK bearing?",
        "a": "A 6212-NSK deep-groove ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6212-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6212-NSK need?",
        "a": "The open 6212-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6212?",
        "a": "NSK lists the open 6212 under the bare designation 6212; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 60 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6212 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6212-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6212-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "212-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6212",
      "NSK 6212",
      "6212-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6213-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6213DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 63,
    "static_load_kN": 40,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6213-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 120 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6213DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 65 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6213 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6213-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6213-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6213-2RS drags the lip and overheats it.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6213DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 65 mm bore 6213 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6213 at 63 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1000 g (1.0 kg), 6213 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 63/40 kN load ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213DDU on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6213-2RS bearing?",
        "a": "A 6213-2RS deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6213-2RS be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6213-2RS need?",
        "a": "6213-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6213 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6213?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6213DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×120×23 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6213DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6213-2RS",
      "6213-2rs",
      "6213DDU",
      "NSK 6213DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6213-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6213VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 63,
    "static_load_kN": 40,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6213VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 65 mm bore; before upgrading to a 6313 for extra capacity, confirm the housing accepts a 120 mm OD and 23 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6213-RSR run faster than contact-seal 6213-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6213-2RS instead.",
      "The low-drag lip of 6213-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Vibration during standstill brinells the raceways of a 65 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Never mix components between two 6213-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues this low-friction non-contact seal as 6213VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 65 mm bore 6213 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6213 at 63 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1000 g (1.0 kg), 6213 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 63/40 kN load ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213VV on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6213; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6213 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6213-RSR bearing?",
        "a": "A 6213-RSR deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6213-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6200 compare with other series at the same 65 mm bore?",
        "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6213?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6213VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×120×23 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6213 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6213-RSR",
      "6213-rsr",
      "6213VV",
      "NSK 6213VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6213-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6213ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 63,
    "static_load_kN": 40,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6213ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6213 with C3 clearance and re-check the residual value after mounting.",
      "At 65 mm bore the 62xx light series is the workhorse section; its 120×23 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6213-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6213-2RS for that.",
      "Do not wash 6213-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6213-ZZ-NSK.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6213ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 65 mm bore 6213 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6213 at 63 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1000 g (1.0 kg), 6213 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 63/40 kN load ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213ZZ on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6213; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6213-ZZ-NSK bearing?",
        "a": "A 6213-ZZ-NSK deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6213-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6200 compare with other series at the same 65 mm bore?",
        "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6213?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6213ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×120×23 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6213ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6213-ZZ",
      "6213-zz",
      "6213ZZ",
      "NSK 6213ZZ",
      "6213-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6213-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6213",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 63,
    "static_load_kN": 40,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6213 with C3 for those conditions.",
      "At 65 mm bore the 62xx light series is the workhorse section; its 120×23 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6213-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6213 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 23 mm-wide ring of 6213-NSK drags the lip and overheats it.",
      "The open 6213 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 65 mm bore 6213 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6213 at 63 kN dynamic (C) and 40 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1000 g (1.0 kg), 6213 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×120×23 mm envelope of 6213 gives a D/d ratio of 1.85 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 63/40 kN load ratings, mass 1000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6213 on the 65×120×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6213 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6213-NSK bearing?",
        "a": "A 6213-NSK deep-groove ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 65 mm bore?",
        "a": "The '2' is the light diameter series: 120×23 mm with a 27.5 mm radial section at 65 mm bore. A 6313 on the same bore is larger and higher-rated; a 6013 is smaller and lower-rated."
      },
      {
        "q": "Are 6213 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6213 uses the same ISO 15 envelope (65×120×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6213?",
        "a": "NSK lists the open 6213 under the bare designation 6213; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 65 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6213 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6213-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6213-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "213-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6213",
      "NSK 6213",
      "6213-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6214-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6214DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68.5,
    "static_load_kN": 44,
    "weight_g": 1090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6214-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 125 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6214DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.",
      "Contact seals add drag and heat: 6214-2RS-NSK runs slower and cooler-limited than the open 6214; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6214-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Measure the shaft, do not trust the drawing: a 70 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6214-2RS-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6214-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6214DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 70 mm bore 6214 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6214 at 68.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1090 g (1.1 kg), 6214 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 68.5/44 kN load ratings, mass 1090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6214DDU on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6214-2RS-NSK bearing?",
        "a": "A 6214-2RS-NSK deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6200 compare with other series at the same 70 mm bore?",
        "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated."
      },
      {
        "q": "Are 6214 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6214 uses the same ISO 15 envelope (70×125×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6214?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6214DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×125×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6214DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6214-2RS",
      "6214-2rs",
      "6214DDU",
      "NSK 6214DDU",
      "6214-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6214-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6214VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68.5,
    "static_load_kN": 44,
    "weight_g": 1090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6214VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.",
      "The 62xx light series is the default general-purpose section at 70 mm bore; before upgrading to a 6314 for extra capacity, confirm the housing accepts a 125 mm OD and 24 mm width — it is not a drop-in swap.",
      "The low-drag lip of 6214-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6214-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 70 mm bore position before relying on it as sealed-for-life.",
      "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6214VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 70 mm bore 6214 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6214 at 68.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1090 g (1.1 kg), 6214 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 68.5/44 kN load ratings, mass 1090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6214VV on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6214-RSR bearing?",
        "a": "A 6214-RSR deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6200 compare with other series at the same 70 mm bore?",
        "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated."
      },
      {
        "q": "Are 6214 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6214 uses the same ISO 15 envelope (70×125×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6214?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6214VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×125×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6214VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6214-RSR",
      "6214-rsr",
      "6214VV",
      "NSK 6214VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6214-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6214ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68.5,
    "static_load_kN": 44,
    "weight_g": 1090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6214-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 125 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6214ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.",
      "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6214-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6214-2RS for that.",
      "Shielded 6214-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6214ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 70 mm bore 6214 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6214 at 68.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1090 g (1.1 kg), 6214 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 68.5/44 kN load ratings, mass 1090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6214ZZ on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6214-ZZ-NSK bearing?",
        "a": "A 6214-ZZ-NSK deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 70 mm bore?",
        "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated."
      },
      {
        "q": "Are 6214 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6214 uses the same ISO 15 envelope (70×125×24 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6214?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6214ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×125×24 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6214ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6214-ZZ",
      "6214-zz",
      "6214ZZ",
      "NSK 6214ZZ",
      "6214-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6214-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6214",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68.5,
    "static_load_kN": 44,
    "weight_g": 1090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6214 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 125 mm outside diameter and 24 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6214 with C3 for those conditions.",
      "At 70 mm bore the 62xx light series is the workhorse section; its 125×24 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6214-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6214 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 24 mm-wide ring of 6214-NSK drags the lip and overheats it.",
      "The housing bore for the 125 mm OD should be round within IT7; an oval bore pinches the outer ring of 6214-NSK and shows up later as two-point loaded raceway wear.",
      "The open 6214 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 70 mm bore 6214 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6214 at 68.5 kN dynamic (C) and 44 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1090 g (1.1 kg), 6214 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×125×24 mm envelope of 6214 gives a D/d ratio of 1.79 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 68.5/44 kN load ratings, mass 1090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6214 on the 70×125×24 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6214 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6214-NSK bearing?",
        "a": "A 6214-NSK deep-groove ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6214 mean?",
        "a": "A bare 6214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 70 mm bore?",
        "a": "The '2' is the light diameter series: 125×24 mm with a 27.5 mm radial section at 70 mm bore. A 6314 on the same bore is larger and higher-rated; a 6014 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6214?",
        "a": "NSK lists the open 6214 under the bare designation 6214; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 70 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6214 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6214-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6214-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "214-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6214",
      "NSK 6214",
      "6214-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6215-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6215DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73,
    "static_load_kN": 49.5,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6215DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.",
      "At 75 mm bore the 62xx light series is the workhorse section; its 130×25 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6215-2RS-NSK runs slower and cooler-limited than the open 6215; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6215-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6215-2RS-NSK drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6215-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6215DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 75 mm bore 6215 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 73 kN dynamic load rating (C) and 49.5 kN static (C0), 6215 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1190 g (1.2 kg), 6215 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 73/49.5 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6215DDU on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6215-2RS-NSK bearing?",
        "a": "A 6215-2RS-NSK deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6215-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6200 compare with other series at the same 75 mm bore?",
        "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6215?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6215DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×130×25 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6215DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6215-2RS",
      "6215-2rs",
      "6215DDU",
      "NSK 6215DDU",
      "6215-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6215-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6215VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73,
    "static_load_kN": 49.5,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6215-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6215VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6215-RSR run faster than contact-seal 6215-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6215-2RS instead.",
      "The low-drag lip of 6215-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Never mix components between two 6215-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6215VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 75 mm bore 6215 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 73 kN dynamic load rating (C) and 49.5 kN static (C0), 6215 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1190 g (1.2 kg), 6215 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 73/49.5 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6215VV on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6215-RSR bearing?",
        "a": "A 6215-RSR deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What does the RSR suffix on 6215-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "How does the 6200 compare with other series at the same 75 mm bore?",
        "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6215?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6215VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×130×25 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6215VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6215-RSR",
      "6215-rsr",
      "6215VV",
      "NSK 6215VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6215-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6215ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73,
    "static_load_kN": 49.5,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6215-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6215ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6215-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6215-2RS for that.",
      "Do not wash 6215-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6215-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6215ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 75 mm bore 6215 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 73 kN dynamic load rating (C) and 49.5 kN static (C0), 6215 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1190 g (1.2 kg), 6215 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 73/49.5 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6215ZZ on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6215-ZZ-NSK bearing?",
        "a": "A 6215-ZZ-NSK deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 75 mm bore?",
        "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated."
      },
      {
        "q": "Are 6215 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6215 uses the same ISO 15 envelope (75×130×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6215?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6215ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×130×25 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6215ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6215-ZZ",
      "6215-zz",
      "6215ZZ",
      "NSK 6215ZZ",
      "6215-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6215-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6215",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 73,
    "static_load_kN": 49.5,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6215 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 130 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6215 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 62xx light series is the default general-purpose section at 75 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 130 mm OD and 25 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6215-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6215 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Never mix components between two 6215-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6215 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 75 mm bore 6215 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 73 kN dynamic load rating (C) and 49.5 kN static (C0), 6215 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1190 g (1.2 kg), 6215 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×130×25 mm envelope of 6215 gives a D/d ratio of 1.73 and 27.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 73/49.5 kN load ratings, mass 1190 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6215 on the 75×130×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6215 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6215 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6215-NSK bearing?",
        "a": "A 6215-NSK deep-groove ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6215 mean?",
        "a": "A bare 6215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 75 mm bore?",
        "a": "The '2' is the light diameter series: 130×25 mm with a 27.5 mm radial section at 75 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6215?",
        "a": "NSK lists the open 6215 under the bare designation 6215; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 75 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6215 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6215-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6215-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "215-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6215",
      "NSK 6215",
      "6215-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6216-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6216DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80,
    "static_load_kN": 53,
    "weight_g": 1420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6216-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6216DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 6216 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Heat is the enemy of the sealed 6216-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6216-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6216-2RS-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6216DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 80 mm bore 6216 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 80 kN dynamic load rating (C) and 53 kN static (C0), 6216 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1420 g (1.4 kg), 6216 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 80/53 kN load ratings, mass 1420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6216DDU on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6216 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6216; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6216-2RS-NSK bearing?",
        "a": "A 6216-2RS-NSK deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6216 bore code work?",
        "a": "The last two digits of 6216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6216-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6216?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6216DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×140×26 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6216DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6216-2RS",
      "6216-2rs",
      "6216DDU",
      "NSK 6216DDU",
      "6216-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6216-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6216VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80,
    "static_load_kN": 53,
    "weight_g": 1420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6216-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6216VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 6216 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "RSR low-friction seals on 6216-RSR run faster than contact-seal 6216-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6216-2RS instead.",
      "The non-contact lip of 6216-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 80 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 26 mm-wide ring of 6216-RSR drags the lip and overheats it.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6216VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 80 mm bore 6216 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 80 kN dynamic load rating (C) and 53 kN static (C0), 6216 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1420 g (1.4 kg), 6216 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 80/53 kN load ratings, mass 1420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6216VV on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6216; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6216-RSR bearing?",
        "a": "A 6216-RSR deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6216-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6216-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6216 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6216-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 80 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6216?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6216VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×140×26 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6216VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6216-RSR",
      "6216-rsr",
      "6216VV",
      "NSK 6216VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6216-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6216ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80,
    "static_load_kN": 53,
    "weight_g": 1420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6216-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6216ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 80 mm bore; before upgrading to a 6316 for extra capacity, confirm the housing accepts a 140 mm OD and 26 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6216-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6216-2RS for that.",
      "Do not wash 6216-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6216-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 26 mm-wide ring of 6216-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6216ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 80 mm bore 6216 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 80 kN dynamic load rating (C) and 53 kN static (C0), 6216 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1420 g (1.4 kg), 6216 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 80/53 kN load ratings, mass 1420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6216ZZ on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6216-ZZ-NSK bearing?",
        "a": "A 6216-ZZ-NSK deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 80 mm bore?",
        "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated."
      },
      {
        "q": "Are 6216 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6216 uses the same ISO 15 envelope (80×140×26 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6216?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6216ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×140×26 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6216ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6216-ZZ",
      "6216-zz",
      "6216ZZ",
      "NSK 6216ZZ",
      "6216-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6216-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6216",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 80,
    "static_load_kN": 53,
    "weight_g": 1420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6216 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 140 mm outside diameter and 26 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 80 mm bore the 62xx light series is the workhorse section; its 140×26 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6216-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6216-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 140 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6216-NSK.",
      "The open 6216 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 80 mm bore 6216 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 80 kN dynamic load rating (C) and 53 kN static (C0), 6216 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1420 g (1.4 kg), 6216 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×140×26 mm envelope of 6216 gives a D/d ratio of 1.75 and 30.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 80/53 kN load ratings, mass 1420 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6216 on the 80×140×26 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6216 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6216; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6216-NSK bearing?",
        "a": "A 6216-NSK deep-groove ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6216 mean?",
        "a": "A bare 6216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 80 mm bore?",
        "a": "The '2' is the light diameter series: 140×26 mm with a 30.0 mm radial section at 80 mm bore. A 6316 on the same bore is larger and higher-rated; a 6016 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6216?",
        "a": "NSK lists the open 6216 under the bare designation 6216; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 80 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6216 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6216-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6216-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "216-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6216",
      "NSK 6216",
      "6216-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6217-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6217DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 92.5,
    "static_load_kN": 62,
    "weight_g": 1760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6217-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6217DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 85 mm of 6217-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6217-2RS-NSK runs slower and cooler-limited than the open 6217; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6217-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6217-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6217DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 85 mm bore 6217 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 92.5 kN dynamic load rating (C) and 62 kN static (C0), 6217 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1760 g (1.8 kg), 6217 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 92.5/62 kN load ratings, mass 1760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6217DDU on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6217; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6217 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6217-2RS-NSK bearing?",
        "a": "A 6217-2RS-NSK deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6217 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6217 uses the same ISO 15 envelope (85×150×28 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6217-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6217-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6217 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6217?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6217DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×150×28 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6217DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6217-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6217-2RS",
      "6217-2rs",
      "6217DDU",
      "NSK 6217DDU",
      "6217-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6217-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6217VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 92.5,
    "static_load_kN": 62,
    "weight_g": 1760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6217VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 85 mm of 6217-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.",
      "The low-drag lip of 6217-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6217-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 85 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6217-C3. No clearance suffix means normal CN clearance.",
      "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6217VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 85 mm bore 6217 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 92.5 kN dynamic load rating (C) and 62 kN static (C0), 6217 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1760 g (1.8 kg), 6217 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 92.5/62 kN load ratings, mass 1760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6217VV on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6217-RSR bearing?",
        "a": "A 6217-RSR deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6217-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6217-RSR need?",
        "a": "6217-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6217 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6217?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6217VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×150×28 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6217VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6217-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6217-RSR",
      "6217-rsr",
      "6217VV",
      "NSK 6217VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6217-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6217ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 92.5,
    "static_load_kN": 62,
    "weight_g": 1760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6217-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6217ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 85 mm bore the ring mass is significant: heat 6217 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 85 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 150 mm OD and 28 mm width — it is not a drop-in swap.",
      "Do not wash 6217-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6217-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6217-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 150 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6217-ZZ-NSK.",
      "NSK catalogues the shielded version as 6217ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 85 mm bore 6217 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 92.5 kN dynamic load rating (C) and 62 kN static (C0), 6217 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1760 g (1.8 kg), 6217 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 92.5/62 kN load ratings, mass 1760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6217ZZ on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6217 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6217-ZZ-NSK bearing?",
        "a": "A 6217-ZZ-NSK deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6217 bore code work?",
        "a": "The last two digits of 6217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6217-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6217?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6217ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×150×28 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6217 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6217-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6217-ZZ",
      "6217-zz",
      "6217ZZ",
      "NSK 6217ZZ",
      "6217-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6217-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6217",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 92.5,
    "static_load_kN": 62,
    "weight_g": 1760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6217 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 150 mm outside diameter and 28 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 85 mm bore the ring mass is significant: heat 6217 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 85 mm bore the 62xx light series is the workhorse section; its 150×28 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6217-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6217 units.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 28 mm-wide ring of 6217-NSK drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6217 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 85 mm bore 6217 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 92.5 kN dynamic load rating (C) and 62 kN static (C0), 6217 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1760 g (1.8 kg), 6217 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×150×28 mm envelope of 6217 gives a D/d ratio of 1.76 and 32.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 92.5/62 kN load ratings, mass 1760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6217 on the 85×150×28 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6217 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6217-NSK bearing?",
        "a": "A 6217-NSK deep-groove ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6217-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6217-NSK need?",
        "a": "The open 6217-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6217?",
        "a": "NSK lists the open 6217 under the bare designation 6217; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 85 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6217?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6217-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6217-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "217-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6217",
      "NSK 6217",
      "6217-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6218-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6218DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 106,
    "static_load_kN": 71.5,
    "weight_g": 2180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6218DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 6218 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Heat is the enemy of the sealed 6218-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6218-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6218-2RS-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6218DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 90 mm bore 6218 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 6218 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2180 g (2.2 kg), 6218 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 106/71.5 kN load ratings, mass 2180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6218DDU on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6218; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6218-2RS-NSK bearing?",
        "a": "A 6218-2RS-NSK deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6218-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6218-2RS-NSK need?",
        "a": "6218-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6218 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6218?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6218DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×160×30 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6218 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6218-2RS",
      "6218-2rs",
      "6218DDU",
      "NSK 6218DDU",
      "6218-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6218-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6218VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 106,
    "static_load_kN": 71.5,
    "weight_g": 2180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6218-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6218VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 90 mm bore; before upgrading to a 6318 for extra capacity, confirm the housing accepts a 160 mm OD and 30 mm width — it is not a drop-in swap.",
      "RSR low-friction seals on 6218-RSR run faster than contact-seal 6218-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6218-2RS instead.",
      "The non-contact lip of 6218-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6218-C3. No clearance suffix means normal CN clearance.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6218-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6218VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 90 mm bore 6218 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 6218 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2180 g (2.2 kg), 6218 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 106/71.5 kN load ratings, mass 2180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6218VV on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6218 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6218-RSR bearing?",
        "a": "A 6218-RSR deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6218-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6218-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6218 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6218-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6218?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6218VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×160×30 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6218VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6218-RSR",
      "6218-rsr",
      "6218VV",
      "NSK 6218VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6218-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6218ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 106,
    "static_load_kN": 71.5,
    "weight_g": 2180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6218-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6218ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 6218-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6218-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6218-2RS for that.",
      "Shielded 6218-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Never mix components between two 6218-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6218ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 90 mm bore 6218 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 6218 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2180 g (2.2 kg), 6218 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 106/71.5 kN load ratings, mass 2180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6218ZZ on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6218-ZZ-NSK bearing?",
        "a": "A 6218-ZZ-NSK deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 90 mm bore?",
        "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated."
      },
      {
        "q": "Are 6218 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6218 uses the same ISO 15 envelope (90×160×30 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6218?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6218ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×160×30 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6218 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6218-ZZ",
      "6218-zz",
      "6218ZZ",
      "NSK 6218ZZ",
      "6218-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6218-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6218",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 106,
    "static_load_kN": 71.5,
    "weight_g": 2180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6218 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 160 mm outside diameter and 30 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 6218-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 90 mm bore the 62xx light series is the workhorse section; its 160×30 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6218-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6218 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6218 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 90 mm bore 6218 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 106 kN dynamic load rating (C) and 71.5 kN static (C0), 6218 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2180 g (2.2 kg), 6218 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×160×30 mm envelope of 6218 gives a D/d ratio of 1.78 and 35.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 106/71.5 kN load ratings, mass 2180 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6218 on the 90×160×30 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6218 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6218 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6218-NSK bearing?",
        "a": "A 6218-NSK deep-groove ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 90 mm bore?",
        "a": "The '2' is the light diameter series: 160×30 mm with a 35.0 mm radial section at 90 mm bore. A 6318 on the same bore is larger and higher-rated; a 6018 is smaller and lower-rated."
      },
      {
        "q": "Are 6218 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6218 uses the same ISO 15 envelope (90×160×30 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6218?",
        "a": "NSK lists the open 6218 under the bare designation 6218; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 90 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6218?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6218-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6218-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "218-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6218",
      "NSK 6218",
      "6218-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6219-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6219DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 120,
    "static_load_kN": 82,
    "weight_g": 2640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6219DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6219-2RS-NSK runs slower and cooler-limited than the open 6219; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6219-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6219DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 95 mm bore 6219 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 120 kN dynamic load rating (C) and 82 kN static (C0), 6219 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2640 g (2.6 kg), 6219 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 120/82 kN load ratings, mass 2640 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6219DDU on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6219; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6219-2RS-NSK bearing?",
        "a": "A 6219-2RS-NSK deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6219-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6200 compare with other series at the same 95 mm bore?",
        "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK suffix for a sealed 6219?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6219DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×170×32 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6219 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6219-2RS",
      "6219-2rs",
      "6219DDU",
      "NSK 6219DDU",
      "6219-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6219-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6219VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 120,
    "static_load_kN": 82,
    "weight_g": 2640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6219-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6219VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6219-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6219-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 95 mm bore position before relying on it as sealed-for-life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6219VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 95 mm bore 6219 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 120 kN dynamic load rating (C) and 82 kN static (C0), 6219 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2640 g (2.6 kg), 6219 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 120/82 kN load ratings, mass 2640 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6219VV on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6219 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6219-RSR bearing?",
        "a": "A 6219-RSR deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6219-RSR need?",
        "a": "6219-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6219 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6219 bore code work?",
        "a": "The last two digits of 6219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6219?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6219VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×170×32 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6219VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6219-RSR",
      "6219-rsr",
      "6219VV",
      "NSK 6219VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6219-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6219ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 120,
    "static_load_kN": 82,
    "weight_g": 2640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6219ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 6219-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 95 mm bore; before upgrading to a 6319 for extra capacity, confirm the housing accepts a 170 mm OD and 32 mm width — it is not a drop-in swap.",
      "Do not wash 6219-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6219-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 32 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6219ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 95 mm bore 6219 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 120 kN dynamic load rating (C) and 82 kN static (C0), 6219 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2640 g (2.6 kg), 6219 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 120/82 kN load ratings, mass 2640 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6219ZZ on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6219-ZZ-NSK bearing?",
        "a": "A 6219-ZZ-NSK deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6219-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6219-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6219 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6219-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6219?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6219ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×170×32 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6219ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6219-ZZ",
      "6219-zz",
      "6219ZZ",
      "NSK 6219ZZ",
      "6219-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6219-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6219",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 120,
    "static_load_kN": 82,
    "weight_g": 2640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6219 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 170 mm outside diameter and 32 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 95 mm bore the 62xx light series is the workhorse section; its 170×32 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6219-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6219 units.",
      "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6219-NSK.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6219 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 95 mm bore 6219 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 120 kN dynamic load rating (C) and 82 kN static (C0), 6219 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2640 g (2.6 kg), 6219 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 95×170×32 mm envelope of 6219 gives a D/d ratio of 1.79 and 37.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 120/82 kN load ratings, mass 2640 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6219 on the 95×170×32 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6219 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6219-NSK bearing?",
        "a": "A 6219-NSK deep-groove ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6219 mean?",
        "a": "A bare 6219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 95 mm bore?",
        "a": "The '2' is the light diameter series: 170×32 mm with a 37.5 mm radial section at 95 mm bore. A 6319 on the same bore is larger and higher-rated; a 6019 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6219?",
        "a": "NSK lists the open 6219 under the bare designation 6219; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 95 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6219 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6219-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6219-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "219-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6219",
      "NSK 6219",
      "6219-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6220-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6220DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 134,
    "static_load_kN": 93,
    "weight_g": 3170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6220-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6220DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 100 mm bore the 62xx light series is the workhorse section; its 180×34 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6220-2RS-NSK runs slower and cooler-limited than the open 6220; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6220-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6220-2RS-NSK.",
      "Never mix components between two 6220-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the contact-sealed version as 6220DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 100 mm bore 6220 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 134 kN dynamic load rating (C) and 93 kN static (C0), 6220 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3170 g (3.2 kg), 6220 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 134/93 kN load ratings, mass 3170 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6220DDU on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6220-2RS-NSK bearing?",
        "a": "A 6220-2RS-NSK deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6220 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6220 uses the same ISO 15 envelope (100×180×34 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6220-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6220-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6220?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6220DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×180×34 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6220DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6220-2RS",
      "6220-2rs",
      "6220DDU",
      "NSK 6220DDU",
      "6220-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6220-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6220VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 134,
    "static_load_kN": 93,
    "weight_g": 3170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6220-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6220VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.",
      "The low-drag lip of 6220-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6220-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6220-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 100 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6220-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6220VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 100 mm bore 6220 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 134 kN dynamic load rating (C) and 93 kN static (C0), 6220 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3170 g (3.2 kg), 6220 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 134/93 kN load ratings, mass 3170 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6220VV on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6220-RSR bearing?",
        "a": "A 6220-RSR deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6220-RSR need?",
        "a": "6220-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6220 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6220 bore code work?",
        "a": "The last two digits of 6220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6220?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6220VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×180×34 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6220VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6220-RSR",
      "6220-rsr",
      "6220VV",
      "NSK 6220VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6220-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6220ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 134,
    "static_load_kN": 93,
    "weight_g": 3170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6220ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 100 mm bore the ring mass is significant: heat 6220 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 100 mm bore the 62xx light series is the workhorse section; its 180×34 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6220-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6220-2RS for that.",
      "Shielded 6220-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Vibration during standstill brinells the raceways of a 100 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6220ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 100 mm bore 6220 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 134 kN dynamic load rating (C) and 93 kN static (C0), 6220 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3170 g (3.2 kg), 6220 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 134/93 kN load ratings, mass 3170 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6220ZZ on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6220; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6220-ZZ-NSK bearing?",
        "a": "A 6220-ZZ-NSK deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6220-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6220-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6220 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6220-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6220?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6220ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×180×34 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6220ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6220-ZZ",
      "6220-zz",
      "6220ZZ",
      "NSK 6220ZZ",
      "6220-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6220-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6220",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 134,
    "static_load_kN": 93,
    "weight_g": 3170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6220 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 180 mm outside diameter and 34 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 100 mm bore; before upgrading to a 6320 for extra capacity, confirm the housing accepts a 180 mm OD and 34 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6220-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6220 units.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6220 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 100 mm bore 6220 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 134 kN dynamic load rating (C) and 93 kN static (C0), 6220 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3170 g (3.2 kg), 6220 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 100×180×34 mm envelope of 6220 gives a D/d ratio of 1.80 and 40.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 134/93 kN load ratings, mass 3170 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6220 on the 100×180×34 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6220 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6220; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6220 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6220-NSK bearing?",
        "a": "A 6220-NSK deep-groove ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6220 mean?",
        "a": "A bare 6220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 100 mm bore?",
        "a": "The '2' is the light diameter series: 180×34 mm with a 40.0 mm radial section at 100 mm bore. A 6320 on the same bore is larger and higher-rated; a 6020 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6220?",
        "a": "NSK lists the open 6220 under the bare designation 6220; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 100 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6220?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6220-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6220-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "220-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6220",
      "NSK 6220",
      "6220-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6221-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6221DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 105,
    "weight_g": 3790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6221DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 105 mm bore the ring mass is significant: heat 6221 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6221-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6221-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 36 mm-wide ring of 6221-2RS drags the lip and overheats it.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6221DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 105 mm bore 6221 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6221 at 146 kN dynamic (C) and 105 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 3790 g (3.8 kg), 6221 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 146/105 kN load ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221DDU on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6221; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6221-2RS bearing?",
        "a": "A 6221-2RS deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6221 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6221 uses the same ISO 15 envelope (105×190×36 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6221-2RS have?",
        "a": "Unless a clearance suffix says otherwise, 6221-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6221?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6221DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×190×36 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6221 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6221-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6221-2RS",
      "6221-2rs",
      "6221DDU",
      "NSK 6221DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6221-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6221VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 105,
    "weight_g": 3790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6221-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 190 mm outside diameter and 36 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6221VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.",
      "The low-drag lip of 6221-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6221-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 105 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6221-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6221VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 105 mm bore 6221 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6221 at 146 kN dynamic (C) and 105 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 3790 g (3.8 kg), 6221 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 146/105 kN load ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221VV on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6221 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6221-RSR bearing?",
        "a": "A 6221-RSR deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6221 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6221 uses the same ISO 15 envelope (105×190×36 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6221-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6221-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6221?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6221VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×190×36 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6221 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6221-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6221-RSR",
      "6221-rsr",
      "6221VV",
      "NSK 6221VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6221-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6221ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 105,
    "weight_g": 3790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6221ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6221-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6221-2RS for that.",
      "Do not wash 6221-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6221-ZZ-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6221-ZZ-NSK.",
      "NSK catalogues the shielded version as 6221ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 105 mm bore 6221 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6221 at 146 kN dynamic (C) and 105 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 3790 g (3.8 kg), 6221 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 146/105 kN load ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221ZZ on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6221-ZZ-NSK bearing?",
        "a": "A 6221-ZZ-NSK deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6221 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6221 uses the same ISO 15 envelope (105×190×36 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6221-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6221-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6221?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6221ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×190×36 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6221ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6221-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6221-ZZ",
      "6221-zz",
      "6221ZZ",
      "NSK 6221ZZ",
      "6221-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6221-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6221",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 105,
    "weight_g": 3790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 105 mm of 6221-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 105 mm bore; before upgrading to a 6321 for extra capacity, confirm the housing accepts a 190 mm OD and 36 mm width — it is not a drop-in swap.",
      "The open 6221-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6221-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 36 mm-wide ring of 6221-NSK drags the lip and overheats it.",
      "The open 6221 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 105 mm bore 6221 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6221 at 146 kN dynamic (C) and 105 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 3790 g (3.8 kg), 6221 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 105×190×36 mm envelope of 6221 gives a D/d ratio of 1.81 and 42.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 146/105 kN load ratings, mass 3790 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6221 on the 105×190×36 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6221 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6221; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6221-NSK bearing?",
        "a": "A 6221-NSK deep-groove ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width (4.134 × 7.48 × 1.417 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6221-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6221-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6221 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6221-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6221?",
        "a": "NSK lists the open 6221 under the bare designation 6221; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 105 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6221?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6221-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6221-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6221",
      "NSK 6221",
      "6221-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6222-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6222DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 159,
    "static_load_kN": 117,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6222DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 110 mm of 6222-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.",
      "Heat is the enemy of the sealed 6222-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6222-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6222-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6222-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the contact-sealed version as 6222DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 110 mm bore 6222 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6222 at 159 kN dynamic (C) and 117 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4450 g (4.5 kg), 6222 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 159/117 kN load ratings, mass 4450 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6222DDU on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6222 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6222; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6222-2RS-NSK bearing?",
        "a": "A 6222-2RS-NSK deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6222 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6222-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6222-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6222?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6222DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×200×38 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6222 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6222-2RS",
      "6222-2rs",
      "6222DDU",
      "NSK 6222DDU",
      "6222-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6222-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6222VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 159,
    "static_load_kN": 117,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6222-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 200 mm outside diameter and 38 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6222VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 110 mm bore the ring mass is significant: heat 6222 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 110 mm bore the 62xx light series is the workhorse section; its 200×38 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6222-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6222-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 110 mm bore position before relying on it as sealed-for-life.",
      "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6222VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 110 mm bore 6222 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6222 at 159 kN dynamic (C) and 117 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4450 g (4.5 kg), 6222 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 159/117 kN load ratings, mass 4450 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6222VV on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6222 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6222; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6222-RSR bearing?",
        "a": "A 6222-RSR deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6222-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6222-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6222-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6222?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6222VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×200×38 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6222VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6222-RSR",
      "6222-rsr",
      "6222VV",
      "NSK 6222VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6222-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6222ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 159,
    "static_load_kN": 117,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6222ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 110 mm bore the 62xx light series is the workhorse section; its 200×38 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6222-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6222-2RS for that.",
      "Do not wash 6222-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Never mix components between two 6222-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6222ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 110 mm bore 6222 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6222 at 159 kN dynamic (C) and 117 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4450 g (4.5 kg), 6222 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 159/117 kN load ratings, mass 4450 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6222ZZ on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6222 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6222-ZZ-NSK bearing?",
        "a": "A 6222-ZZ-NSK deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6222 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6222 uses the same ISO 15 envelope (110×200×38 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6222-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6222-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6222 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6222?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6222ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×200×38 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6222ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6222-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6222-ZZ",
      "6222-zz",
      "6222ZZ",
      "NSK 6222ZZ",
      "6222-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6222-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6222",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 159,
    "static_load_kN": 117,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 110 mm bore; before upgrading to a 6322 for extra capacity, confirm the housing accepts a 200 mm OD and 38 mm width — it is not a drop-in swap.",
      "The open 6222-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6222-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6222-NSK-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6222-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6222 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 110 mm bore 6222 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6222 at 159 kN dynamic (C) and 117 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4450 g (4.5 kg), 6222 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 110×200×38 mm envelope of 6222 gives a D/d ratio of 1.82 and 45.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 159/117 kN load ratings, mass 4450 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6222 on the 110×200×38 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6222 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6222-NSK bearing?",
        "a": "A 6222-NSK deep-groove ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width (4.331 × 7.874 × 1.496 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6222-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6222-NSK need?",
        "a": "The open 6222-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6222?",
        "a": "NSK lists the open 6222 under the bare designation 6222; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 110 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6222 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6222-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6222-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6222",
      "NSK 6222",
      "6222-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6224-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6224DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 171,
    "static_load_kN": 131,
    "weight_g": 5290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6224DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 6224-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 120 mm bore the 62xx light series is the workhorse section; its 215×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Contact seals add drag and heat: 6224-2RS-NSK runs slower and cooler-limited than the open 6224; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6224-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Never mix components between two 6224-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6224DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 120 mm bore 6224 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6224 at 171 kN dynamic (C) and 131 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5290 g (5.3 kg), 6224 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 171/131 kN load ratings, mass 5290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6224DDU on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6224-2RS-NSK bearing?",
        "a": "A 6224-2RS-NSK deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6224-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 120 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6224-2RS-NSK need?",
        "a": "6224-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6224 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6224?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6224DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×215×40 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6224DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6224-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6224-2RS",
      "6224-2rs",
      "6224DDU",
      "NSK 6224DDU",
      "6224-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6224-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6224VV",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 171,
    "static_load_kN": 131,
    "weight_g": 5290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6224VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 6224-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 120 mm bore the 62xx light series is the workhorse section; its 215×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The low-drag lip of 6224-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6224-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 120 mm bore position before relying on it as sealed-for-life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6224-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6224VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 120 mm bore 6224 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6224 at 171 kN dynamic (C) and 131 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5290 g (5.3 kg), 6224 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 171/131 kN load ratings, mass 5290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6224VV on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6224; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6224-RSR bearing?",
        "a": "A 6224-RSR deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6224 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6224-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6224-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6224 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6224?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6224VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×215×40 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6224VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6224-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6224-RSR",
      "6224-rsr",
      "6224VV",
      "NSK 6224VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6224-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6224ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 171,
    "static_load_kN": 131,
    "weight_g": 5290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6224ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 6224 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 120 mm bore the 62xx light series is the workhorse section; its 215×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6224-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6224-2RS for that.",
      "Shielded 6224-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 120 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6224ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 120 mm bore 6224 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6224 at 171 kN dynamic (C) and 131 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5290 g (5.3 kg), 6224 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 171/131 kN load ratings, mass 5290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6224ZZ on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6224-ZZ-NSK bearing?",
        "a": "A 6224-ZZ-NSK deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6224 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6224-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6224-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6224 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6224?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6224ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×215×40 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6224ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6224-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6224-ZZ",
      "6224-zz",
      "6224ZZ",
      "NSK 6224ZZ",
      "6224-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6224-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6224",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 171,
    "static_load_kN": 131,
    "weight_g": 5290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6224 carries bore code 24 = 120 mm. Outside diameter 215 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 6224 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 120 mm bore the 62xx light series is the workhorse section; its 215×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6224-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6224 units.",
      "Never mix components between two 6224-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6224-NSK.",
      "The open 6224 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 120 mm bore 6224 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6224 at 171 kN dynamic (C) and 131 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5290 g (5.3 kg), 6224 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×215×40 mm envelope of 6224 gives a D/d ratio of 1.79 and 47.5 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 171/131 kN load ratings, mass 5290 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6224 on the 120×215×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6224 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6224 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6224-NSK bearing?",
        "a": "A 6224-NSK deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6224-NSK need?",
        "a": "The open 6224-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6224 bore code work?",
        "a": "The last two digits of 6224 are bore code 24, giving 24 × 5 = 120 mm bore. The 215 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6224?",
        "a": "NSK lists the open 6224 under the bare designation 6224; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 120 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6224 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6224-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6224-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6224",
      "NSK 6224",
      "6224-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6226-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6226ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 184,
    "static_load_kN": 146,
    "weight_g": 5960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6226ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass is significant: heat 6226 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 130 mm bore; before upgrading to a 6326 for extra capacity, confirm the housing accepts a 230 mm OD and 40 mm width — it is not a drop-in swap.",
      "Do not wash 6226-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6226-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 130 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6226-ZZ-NSK.",
      "NSK catalogues the shielded version as 6226ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 130 mm bore places 6226 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6226 at 184 kN dynamic (C) and 146 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5960 g (6.0 kg), 6226 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 184/146 kN load ratings, mass 5960 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6226ZZ on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6226 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6226-ZZ-NSK bearing?",
        "a": "A 6226-ZZ-NSK deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6226 bore code work?",
        "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6226-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6226?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6226ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×230×40 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6226ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6226-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6226-ZZ",
      "6226-zz",
      "6226ZZ",
      "NSK 6226ZZ",
      "6226-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6226-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6226",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 184,
    "static_load_kN": 146,
    "weight_g": 5960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6226 carries bore code 26 = 130 mm. Outside diameter 230 mm and width 40 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass is significant: heat 6226 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 130 mm bore the 62xx light series is the workhorse section; its 230×40 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6226-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6226 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6226 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 130 mm bore places 6226 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6226 at 184 kN dynamic (C) and 146 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5960 g (6.0 kg), 6226 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×230×40 mm envelope of 6226 gives a D/d ratio of 1.77 and 50.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 184/146 kN load ratings, mass 5960 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6226 on the 130×230×40 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6226 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6226; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6226-NSK bearing?",
        "a": "A 6226-NSK deep-groove ball bearing has a 130 mm bore, 230 mm outer diameter and 40 mm width (5.118 × 9.055 × 1.575 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6226 bore code work?",
        "a": "The last two digits of 6226 are bore code 26, giving 26 × 5 = 130 mm bore. The 230 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6226 mean?",
        "a": "A bare 6226 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 6226?",
        "a": "NSK lists the open 6226 under the bare designation 6226; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6226 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6226-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6226-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6226",
      "NSK 6226",
      "6226-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6228-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6228DDU",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 183,
    "static_load_kN": 150,
    "weight_g": 7680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6228DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 140 mm bore the 62xx light series is the workhorse section; its 250×42 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Heat is the enemy of the sealed 6228-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6228-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6228-C3. No clearance suffix means normal CN clearance.",
      "Measure the shaft, do not trust the drawing: a 140 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6228-2RS.",
      "NSK catalogues the contact-sealed version as 6228DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 140 mm bore places 6228 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6228 at 183 kN dynamic (C) and 150 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7680 g (7.7 kg), 6228 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 183/150 kN load ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228DDU on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6228; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6228-2RS bearing?",
        "a": "A 6228-2RS deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6228 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6228-2RS have?",
        "a": "Unless a clearance suffix says otherwise, 6228-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6228 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6228?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6228DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×250×42 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6228DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6228-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6228-2RS",
      "6228-2rs",
      "6228DDU",
      "NSK 6228DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6228-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6228ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 183,
    "static_load_kN": 150,
    "weight_g": 7680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6228ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 140 mm bore; before upgrading to a 6328 for extra capacity, confirm the housing accepts a 250 mm OD and 42 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6228-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6228-2RS for that.",
      "Shielded 6228-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6228-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 42 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6228ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 140 mm bore places 6228 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6228 at 183 kN dynamic (C) and 150 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7680 g (7.7 kg), 6228 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 183/150 kN load ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228ZZ on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6228; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6228-ZZ bearing?",
        "a": "A 6228-ZZ deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 140 mm bore?",
        "a": "The '2' is the light diameter series: 250×42 mm with a 55.0 mm radial section at 140 mm bore. A 6328 on the same bore is larger and higher-rated; a 6028 is smaller and lower-rated."
      },
      {
        "q": "Are 6228 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6228 uses the same ISO 15 envelope (140×250×42 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6228?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6228ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×250×42 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6228 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6228-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6228-ZZ",
      "6228-zz",
      "6228ZZ",
      "NSK 6228ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6228-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6228",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 183,
    "static_load_kN": 150,
    "weight_g": 7680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6228 carries bore code 28 = 140 mm. Outside diameter 250 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 140 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 140 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "At 140 mm bore the 62xx light series is the workhorse section; its 250×42 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6228-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6228 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6228-NSK-C3. No clearance suffix means normal CN clearance.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6228 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 140 mm bore places 6228 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6228 at 183 kN dynamic (C) and 150 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7680 g (7.7 kg), 6228 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 140×250×42 mm envelope of 6228 gives a D/d ratio of 1.79 and 55.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 183/150 kN load ratings, mass 7680 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6228 on the 140×250×42 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6228 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6228; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6228-NSK bearing?",
        "a": "A 6228-NSK deep-groove ball bearing has a 140 mm bore, 250 mm outer diameter and 42 mm width (5.512 × 9.843 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6228-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 140 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6228-NSK need?",
        "a": "The open 6228-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6228?",
        "a": "NSK lists the open 6228 under the bare designation 6228; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6228 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6228-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6228-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6228",
      "NSK 6228",
      "6228-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6230-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6230ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 194,
    "static_load_kN": 168,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6230ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore the ring mass is significant: heat 6230 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6230-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6230-2RS for that.",
      "Do not wash 6230-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6230-C3. No clearance suffix means normal CN clearance.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6230ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 150 mm bore places 6230 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6230 at 194 kN dynamic (C) and 168 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 10000 g (10.0 kg), 6230 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 194/168 kN load ratings, mass 10000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6230ZZ on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6230 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6230-ZZ bearing?",
        "a": "A 6230-ZZ deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6230-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6230-ZZ need?",
        "a": "6230-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6230?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6230ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×270×45 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6230ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6230-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6230-ZZ",
      "6230-zz",
      "6230ZZ",
      "NSK 6230ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6230-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6230",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 194,
    "static_load_kN": 168,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6230 carries bore code 30 = 150 mm. Outside diameter 270 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 150 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 150 mm of 6230-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 150 mm bore; before upgrading to a 6330 for extra capacity, confirm the housing accepts a 270 mm OD and 45 mm width — it is not a drop-in swap.",
      "The open 6230-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 150×270×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6230 units.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6230-NSK.",
      "The open 6230 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 150 mm bore places 6230 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6230 at 194 kN dynamic (C) and 168 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 10000 g (10.0 kg), 6230 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 150×270×45 mm envelope of 6230 gives a D/d ratio of 1.80 and 60.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 194/168 kN load ratings, mass 10000 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6230 on the 150×270×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6230 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6230 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6230-NSK bearing?",
        "a": "A 6230-NSK deep-groove ball bearing has a 150 mm bore, 270 mm outer diameter and 45 mm width (5.906 × 10.63 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6230 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6230 uses the same ISO 15 envelope (150×270×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6230-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6230-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6230 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6230?",
        "a": "NSK lists the open 6230 under the bare designation 6230; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6230 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6230-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6230-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6230",
      "NSK 6230",
      "6230-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6232-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6232ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 204,
    "static_load_kN": 186,
    "weight_g": 12800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6232 carries bore code 32 = 160 mm. Outside diameter 290 mm and width 48 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 160 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6232ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 6232 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 160 mm bore the 62xx light series is the workhorse section; its 290×48 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6232-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6232-2RS for that.",
      "Do not wash 6232-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6232ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 160 mm bore places 6232 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6232 at 204 kN dynamic (C) and 186 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12800 g (12.8 kg), 6232 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×290×48 mm envelope of 6232 gives a D/d ratio of 1.81 and 65.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 204/186 kN load ratings, mass 12800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6232ZZ on the 160×290×48 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6232 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6232; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6232-ZZ bearing?",
        "a": "A 6232-ZZ deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 160 mm bore?",
        "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated."
      },
      {
        "q": "Are 6232 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6232 uses the same ISO 15 envelope (160×290×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6232?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6232ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×290×48 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6232 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6232-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6232",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6232-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6232-ZZ",
      "6232-zz",
      "6232ZZ",
      "NSK 6232ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6232-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6232",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 204,
    "static_load_kN": 186,
    "weight_g": 12800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6232 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 290 mm outside diameter and 48 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 6232 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 160 mm bore; before upgrading to a 6332 for extra capacity, confirm the housing accepts a 290 mm OD and 48 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6232-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6232 units.",
      "A 160 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 48 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6232 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 160 mm bore places 6232 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6232 at 204 kN dynamic (C) and 186 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12800 g (12.8 kg), 6232 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 160×290×48 mm envelope of 6232 gives a D/d ratio of 1.81 and 65.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 204/186 kN load ratings, mass 12800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6232 on the 160×290×48 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6232 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6232 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6232-NSK bearing?",
        "a": "A 6232-NSK deep-groove ball bearing has a 160 mm bore, 290 mm outer diameter and 48 mm width (6.299 × 11.417 × 1.89 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 160 mm bore?",
        "a": "The '2' is the light diameter series: 290×48 mm with a 65.0 mm radial section at 160 mm bore. A 6332 on the same bore is larger and higher-rated; a 6032 is smaller and lower-rated."
      },
      {
        "q": "Are 6232 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6232 uses the same ISO 15 envelope (160×290×48 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6232?",
        "a": "NSK lists the open 6232 under the bare designation 6232; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6232 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6232-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6232",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6232-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 160×290×48 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6232",
      "NSK 6232",
      "6232-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6234-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6234ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 234,
    "static_load_kN": 224,
    "weight_g": 15800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6234 carries bore code 34 = 170 mm. Outside diameter 310 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 170 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6234ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass is significant: heat 6234 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 170 mm bore; before upgrading to a 6334 for extra capacity, confirm the housing accepts a 310 mm OD and 52 mm width — it is not a drop-in swap.",
      "Do not wash 6234-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6234-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6234-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 310 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6234-ZZ.",
      "NSK catalogues the shielded version as 6234ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 170 mm bore places 6234 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6234 at 234 kN dynamic (C) and 224 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 15800 g (15.8 kg), 6234 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×310×52 mm envelope of 6234 gives a D/d ratio of 1.82 and 70.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 234/224 kN load ratings, mass 15800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6234ZZ on the 170×310×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6234 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6234-ZZ bearing?",
        "a": "A 6234-ZZ deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6234-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 170 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6234-ZZ need?",
        "a": "6234-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6234?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6234ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 170×310×52 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6234 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6234-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6234",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6234-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6234-ZZ",
      "6234-zz",
      "6234ZZ",
      "NSK 6234ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6234-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6234",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 234,
    "static_load_kN": 224,
    "weight_g": 15800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6234 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 310 mm outside diameter and 52 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore the ring mass is significant: heat 6234 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 170 mm bore the 62xx light series is the workhorse section; its 310×52 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "The open 6234-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 170×310×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6234-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Vibration during standstill brinells the raceways of a 170 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6234 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 170 mm bore places 6234 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6234 at 234 kN dynamic (C) and 224 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 15800 g (15.8 kg), 6234 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 170×310×52 mm envelope of 6234 gives a D/d ratio of 1.82 and 70.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 234/224 kN load ratings, mass 15800 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6234 on the 170×310×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6234 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6234 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6234-NSK bearing?",
        "a": "A 6234-NSK deep-groove ball bearing has a 170 mm bore, 310 mm outer diameter and 52 mm width (6.693 × 12.205 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 170 mm bore?",
        "a": "The '2' is the light diameter series: 310×52 mm with a 70.0 mm radial section at 170 mm bore. A 6334 on the same bore is larger and higher-rated; a 6034 is smaller and lower-rated."
      },
      {
        "q": "Are 6234 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6234 uses the same ISO 15 envelope (170×310×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6234?",
        "a": "NSK lists the open 6234 under the bare designation 6234; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6234 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6234-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6234",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6234-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6234",
      "NSK 6234",
      "6234-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6236-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6236ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 250,
    "static_load_kN": 241,
    "weight_g": 15900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6236 carries bore code 36 = 180 mm. Outside diameter 320 mm and width 52 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6236ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 180 mm bore the ring mass is significant: heat 6236 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6236-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6236-2RS for that.",
      "Do not wash 6236-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 180 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6236-ZZ.",
      "NSK catalogues the shielded version as 6236ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 180 mm bore places 6236 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6236 at 250 kN dynamic (C) and 241 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 15900 g (15.9 kg), 6236 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 180×320×52 mm envelope of 6236 gives a D/d ratio of 1.78 and 70.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 250/241 kN load ratings, mass 15900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6236ZZ on the 180×320×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6236 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6236 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6236-ZZ bearing?",
        "a": "A 6236-ZZ deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6236 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6236 uses the same ISO 15 envelope (180×320×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6236-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 6236-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6236 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6236?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6236ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 180×320×52 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6236 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6236-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6236",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6236-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6236-ZZ",
      "6236-zz",
      "6236ZZ",
      "NSK 6236ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6236-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6236",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 250,
    "static_load_kN": 241,
    "weight_g": 15900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6236 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 36 by five gives the 180 mm bore; the 320 mm outside diameter and 52 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 180 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 180 mm bore; before upgrading to a 6336 for extra capacity, confirm the housing accepts a 320 mm OD and 52 mm width — it is not a drop-in swap.",
      "The open 6236-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 180×320×52 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6236-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6236 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 180 mm bore places 6236 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6236 at 250 kN dynamic (C) and 241 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 15900 g (15.9 kg), 6236 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 180×320×52 mm envelope of 6236 gives a D/d ratio of 1.78 and 70.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 250/241 kN load ratings, mass 15900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6236 on the 180×320×52 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6236 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6236-NSK bearing?",
        "a": "A 6236-NSK deep-groove ball bearing has a 180 mm bore, 320 mm outer diameter and 52 mm width (7.087 × 12.598 × 2.047 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 180 mm bore?",
        "a": "The '2' is the light diameter series: 320×52 mm with a 70.0 mm radial section at 180 mm bore. A 6336 on the same bore is larger and higher-rated; a 6036 is smaller and lower-rated."
      },
      {
        "q": "Are 6236 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6236 uses the same ISO 15 envelope (180×320×52 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6236?",
        "a": "NSK lists the open 6236 under the bare designation 6236; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6236?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6236-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6236",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6236-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×320×52 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6236",
      "NSK 6236",
      "6236-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6238-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6238ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 280,
    "static_load_kN": 282,
    "weight_g": 22300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6238-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 340 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6238ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 190 mm of 6238-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 190 mm bore; before upgrading to a 6338 for extra capacity, confirm the housing accepts a 340 mm OD and 55 mm width — it is not a drop-in swap.",
      "ZZ shields are non-contact: 6238-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6238-2RS for that.",
      "Do not wash 6238-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6238-ZZ.",
      "Measure the shaft, do not trust the drawing: a 190 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6238-ZZ.",
      "NSK catalogues the shielded version as 6238ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 190 mm bore places 6238 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6238 at 280 kN dynamic (C) and 282 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 22300 g (22.3 kg), 6238 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 190×340×55 mm envelope of 6238 gives a D/d ratio of 1.79 and 75.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 280/282 kN load ratings, mass 22300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6238ZZ on the 190×340×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6238 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6238; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6238-ZZ bearing?",
        "a": "A 6238-ZZ deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6238-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6238-ZZ need?",
        "a": "6238-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6238?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6238ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 190×340×55 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6238 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6238-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6238",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6238-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6238-ZZ",
      "6238-zz",
      "6238ZZ",
      "NSK 6238ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6238-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6238",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 280,
    "static_load_kN": 282,
    "weight_g": 22300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6238 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 38 by five gives the 190 mm bore; the 340 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 190 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass is significant: heat 6238 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "At 190 mm bore the 62xx light series is the workhorse section; its 340×55 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6238-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6238 units.",
      "Never mix components between two 6238-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6238 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 190 mm bore places 6238 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6238 at 280 kN dynamic (C) and 282 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 22300 g (22.3 kg), 6238 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 190×340×55 mm envelope of 6238 gives a D/d ratio of 1.79 and 75.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 280/282 kN load ratings, mass 22300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6238 on the 190×340×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6238 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6238; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6238-NSK bearing?",
        "a": "A 6238-NSK deep-groove ball bearing has a 190 mm bore, 340 mm outer diameter and 55 mm width (7.48 × 13.386 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6238-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 190 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6238-NSK need?",
        "a": "The open 6238-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6238?",
        "a": "NSK lists the open 6238 under the bare designation 6238; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6238 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6238-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6238",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6238-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×340×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6238",
      "NSK 6238",
      "6238-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6240-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6240ZZ",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 310,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6240 carries bore code 40 = 200 mm. Outside diameter 360 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6240ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 200 mm of 6240-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 200 mm bore the 62xx light series is the workhorse section; its 360×58 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "ZZ shields are non-contact: 6240-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6240-2RS for that.",
      "Do not wash 6240-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6240ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 200 mm bore places 6240 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6240 at 296 kN dynamic (C) and 310 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 26700 g (26.7 kg), 6240 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 200×360×58 mm envelope of 6240 gives a D/d ratio of 1.80 and 80.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 296/310 kN load ratings, mass 26700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6240ZZ on the 200×360×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6240 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6240; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6240-ZZ bearing?",
        "a": "A 6240-ZZ deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6240-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 6240-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6240 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6240-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6240?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6240ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 200×360×58 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6240 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6240-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6240",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6240-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6240-ZZ",
      "6240-zz",
      "6240ZZ",
      "NSK 6240ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6240-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6240",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 310,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6240 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 40 by five gives the 200 mm bore; the 360 mm outside diameter and 58 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 200 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 200 mm of 6240-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 62xx light series is the default general-purpose section at 200 mm bore; before upgrading to a 6340 for extra capacity, confirm the housing accepts a 360 mm OD and 58 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6240-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6240 units.",
      "A 200 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6240 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 200 mm bore places 6240 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6240 at 296 kN dynamic (C) and 310 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 26700 g (26.7 kg), 6240 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 200×360×58 mm envelope of 6240 gives a D/d ratio of 1.80 and 80.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 296/310 kN load ratings, mass 26700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6240 on the 200×360×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6240 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6240-NSK bearing?",
        "a": "A 6240-NSK deep-groove ball bearing has a 200 mm bore, 360 mm outer diameter and 58 mm width (7.874 × 14.173 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6240 mean?",
        "a": "A bare 6240 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6200 compare with other series at the same 200 mm bore?",
        "a": "The '2' is the light diameter series: 360×58 mm with a 80.0 mm radial section at 200 mm bore. A 6340 on the same bore is larger and higher-rated; a 6040 is smaller and lower-rated."
      },
      {
        "q": "What is the NSK order number for an open 6240?",
        "a": "NSK lists the open 6240 under the bare designation 6240; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6240?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6240-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6240",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6240-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 200×360×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6240",
      "NSK 6240",
      "6240-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6244-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6244",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 340,
    "static_load_kN": 375,
    "weight_g": 37400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6244 carries bore code 44 = 220 mm. Outside diameter 400 mm and width 65 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 220 mm of 6244-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "At 220 mm bore the 62xx light series is the workhorse section; its 400×65 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.",
      "Storage matters for open bearings: 6244-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6244 units.",
      "Measure the shaft, do not trust the drawing: a 220 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6244-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6244 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 220 mm bore places 6244 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6244 at 340 kN dynamic (C) and 375 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 37400 g (37.4 kg), 6244 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 220×400×65 mm envelope of 6244 gives a D/d ratio of 1.82 and 90.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 340/375 kN load ratings, mass 37400 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6244 on the 220×400×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6244 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6244; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6244-NSK bearing?",
        "a": "A 6244-NSK deep-groove ball bearing has a 220 mm bore, 400 mm outer diameter and 65 mm width (8.661 × 15.748 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6200 compare with other series at the same 220 mm bore?",
        "a": "The '2' is the light diameter series: 400×65 mm with a 90.0 mm radial section at 220 mm bore. A 6344 on the same bore is larger and higher-rated; a 6044 is smaller and lower-rated."
      },
      {
        "q": "Are 6244 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6244 uses the same ISO 15 envelope (220×400×65 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6244?",
        "a": "NSK lists the open 6244 under the bare designation 6244; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6244?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6244-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6244",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6244-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6244",
      "NSK 6244",
      "6244-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6248",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6248",
    "series": "6200-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 375,
    "static_load_kN": 430,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6248 carries bore code 48 = 240 mm. Outside diameter 440 mm and width 72 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 240 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 240 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 62xx light series is the default general-purpose section at 240 mm bore; before upgrading to a 6348 for extra capacity, confirm the housing accepts a 440 mm OD and 72 mm width — it is not a drop-in swap.",
      "Storage matters for open bearings: 6248 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6248 units.",
      "A 240 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6248 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 240 mm bore places 6248 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6248 at 375 kN dynamic (C) and 430 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 50500 g (50.5 kg), 6248 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 240×440×72 mm envelope of 6248 gives a D/d ratio of 1.83 and 100.0 mm radial section height — a standard NSK medium section that balances load capacity and speed; for this geometry the pressed-steel cage is adequate up to NSK's listed speed ratings, and C3 clearance is the common choice for hot shafts.",
      "The 375/430 kN load ratings, mass 50500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6248 on the 240×440×72 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6248 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6248 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6248 bearing?",
        "a": "A 6248 deep-groove ball bearing has a 240 mm bore, 440 mm outer diameter and 72 mm width (9.449 × 17.323 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6248 need?",
        "a": "The open 6248 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6248 bore code work?",
        "a": "The last two digits of 6248 are bore code 48, giving 48 × 5 = 240 mm bore. The 440 mm outside diameter and 72 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6248?",
        "a": "NSK lists the open 6248 under the bare designation 6248; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6248 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6248-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 240×440×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6248",
      "NSK 6248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6300-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6300DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.9,
    "static_load_kN": 3.45,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 10 = 10 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6300DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6300 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6210.",
      "Heat is the enemy of the sealed 6300-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6300-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6300-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6300DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 10 mm bore the 6300 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6300 at 8.9 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.9/3.45 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6300DDU on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6300-2RS-NSK bearing?",
        "a": "A 6300-2RS-NSK deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6300-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6300-2RS-NSK need?",
        "a": "6300-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6300 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6300?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6300DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×35×11 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6300 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6300-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6300-2RS",
      "6300-2rs",
      "6300DDU",
      "NSK 6300DDU",
      "6300-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6300-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6300VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.9,
    "static_load_kN": 3.45,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6300-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6300VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6300 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.",
      "The low-drag lip of 6300-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6300-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 10 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6300-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6300VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 10 mm bore the 6300 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6300 at 8.9 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.9/3.45 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6300VV on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6300-RSR-NSK bearing?",
        "a": "A 6300-RSR-NSK deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6300 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6300-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6300-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6300 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6300?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6300VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×35×11 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6300VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6300-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6300-RSR",
      "6300-rsr",
      "6300VV",
      "NSK 6300VV",
      "6300-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6300-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6300ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.9,
    "static_load_kN": 3.45,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6300-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6300ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6300 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.",
      "Do not wash 6300-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6300-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6300-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6300ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 10 mm bore the 6300 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6300 at 8.9 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.9/3.45 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6300ZZ on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6300; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6300-ZZ-NSK bearing?",
        "a": "A 6300-ZZ-NSK deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6300-ZZ-NSK need?",
        "a": "6300-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6300 bore code work?",
        "a": "The last two digits of 6300 are bore code 10, giving 10 × 5 = 10 mm bore. The 35 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6300?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6300ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 10×35×11 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6300 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6300-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6300-ZZ",
      "6300-zz",
      "6300ZZ",
      "NSK 6300ZZ",
      "6300-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6300-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6300",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 10,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 8.9,
    "static_load_kN": 3.45,
    "weight_g": 52,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6300 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6300 with C3 for those conditions.",
      "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6210.",
      "The open 6300-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6300-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "The open 6300 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 10 mm bore the 6300 sits in NSK's miniature range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6300 at 8.9 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 52 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 8.9/3.45 kN load ratings, mass 52 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6300 on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6300; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6300-NSK bearing?",
        "a": "A 6300-NSK deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6300 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6300-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6300-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6300 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6300?",
        "a": "NSK lists the open 6300 under the bare designation 6300; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 10 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6300 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6300-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6300-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6300",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6300",
      "NSK 6300",
      "6300-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6301-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6301DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.7,
    "static_load_kN": 4.2,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6301 carries bore code 12 = 12 mm. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6301DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6301 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6301-2RS-NSK runs slower and cooler-limited than the open 6301; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6301-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6301-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6301DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 12 mm bore the 6301 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6301 at 10.7 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 60 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.7/4.2 kN load ratings, mass 60 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6301DDU on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6301 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6301-2RS-NSK bearing?",
        "a": "A 6301-2RS-NSK deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6301-2RS-NSK need?",
        "a": "6301-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6301 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6301 bore code work?",
        "a": "The last two digits of 6301 are bore code 12, giving 12 × 5 = 12 mm bore. The 37 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6301?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6301DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×37×12 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6301 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6301-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6301-2RS",
      "6301-2rs",
      "6301DDU",
      "NSK 6301DDU",
      "6301-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6301-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6301VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.7,
    "static_load_kN": 4.2,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6301-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6301VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6301 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6301-RSR-NSK run faster than contact-seal 6301-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6301-2RS instead.",
      "The low-drag lip of 6301-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6301-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6301VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 12 mm bore the 6301 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6301 at 10.7 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 60 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.7/4.2 kN load ratings, mass 60 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6301VV on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6301-RSR-NSK bearing?",
        "a": "A 6301-RSR-NSK deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6301-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6301-RSR-NSK need?",
        "a": "6301-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6301 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6301?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6301VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×37×12 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6301VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6301-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6301-RSR",
      "6301-rsr",
      "6301VV",
      "NSK 6301VV",
      "6301-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6301-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6301ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.7,
    "static_load_kN": 4.2,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6301 carries bore code 12 = 12 mm. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6301ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6301 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6212.",
      "ZZ shields are non-contact: 6301-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6301-2RS for that.",
      "Do not wash 6301-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6301ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 12 mm bore the 6301 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6301 at 10.7 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 60 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.7/4.2 kN load ratings, mass 60 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6301ZZ on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6301; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6301 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6301-ZZ-NSK bearing?",
        "a": "A 6301-ZZ-NSK deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6301 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6301 uses the same ISO 15 envelope (12×37×12 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6301-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6301-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6301 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6301?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6301ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 12×37×12 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6301 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6301-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6301-ZZ",
      "6301-zz",
      "6301ZZ",
      "NSK 6301ZZ",
      "6301-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6301-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6301",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 10.7,
    "static_load_kN": 4.2,
    "weight_g": 60,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6301 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6301 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.",
      "The open 6301-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6301-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6301 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 12 mm bore the 6301 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6301 at 10.7 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 60 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 10.7/4.2 kN load ratings, mass 60 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6301 on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6301 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6301-NSK bearing?",
        "a": "A 6301-NSK deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6301-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6301-NSK need?",
        "a": "The open 6301-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6301?",
        "a": "NSK lists the open 6301 under the bare designation 6301; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 12 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6301?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6301-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6301-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6301",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6301",
      "NSK 6301",
      "6301-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6302-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6302DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 5.45,
    "weight_g": 83,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6302 carries bore code 15 = 15 mm. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6302DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6302 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6215.",
      "Contact seals add drag and heat: 6302-2RS-NSK runs slower and cooler-limited than the open 6302; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6302-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never mix components between two 6302-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6302DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 15 mm bore the 6302 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6302 at 12.6 kN dynamic (C) and 5.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 83 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 12.6/5.45 kN load ratings, mass 83 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6302DDU on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6302 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6302-2RS-NSK bearing?",
        "a": "A 6302-2RS-NSK deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6302-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6300 compare with other series at the same 15 mm bore?",
        "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the NSK suffix for a sealed 6302?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6302DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×42×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6302 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6302-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6302-2RS",
      "6302-2rs",
      "6302DDU",
      "NSK 6302DDU",
      "6302-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6302-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6302VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 5.45,
    "weight_g": 83,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6302 carries bore code 15 = 15 mm. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6302VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6302 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6302-RSR-NSK run faster than contact-seal 6302-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6302-2RS instead.",
      "The non-contact lip of 6302-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 15 mm bore position before relying on it as sealed-for-life.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6302-RSR-NSK drags the lip and overheats it.",
      "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6302-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6302VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 15 mm bore the 6302 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6302 at 12.6 kN dynamic (C) and 5.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 83 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 12.6/5.45 kN load ratings, mass 83 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6302VV on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6302; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6302-RSR-NSK bearing?",
        "a": "A 6302-RSR-NSK deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6302-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6302-RSR-NSK need?",
        "a": "6302-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6302 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6302?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6302VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×42×13 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6302 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6302-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6302-RSR",
      "6302-rsr",
      "6302VV",
      "NSK 6302VV",
      "6302-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6302-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6302ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 5.45,
    "weight_g": 83,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6302 carries bore code 15 = 15 mm. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6302ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6302 with C3 for those conditions.",
      "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6302-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6302-2RS for that.",
      "Do not wash 6302-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Never mix components between two 6302-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6302ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 15 mm bore the 6302 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6302 at 12.6 kN dynamic (C) and 5.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 83 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 12.6/5.45 kN load ratings, mass 83 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6302ZZ on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6302 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6302-ZZ-NSK bearing?",
        "a": "A 6302-ZZ-NSK deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6302-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6302-ZZ-NSK need?",
        "a": "6302-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6302?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6302ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 15×42×13 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6302ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6302-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6302-ZZ",
      "6302-zz",
      "6302ZZ",
      "NSK 6302ZZ",
      "6302-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6302-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6302",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 5.45,
    "weight_g": 83,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6302 carries bore code 15 = 15 mm. Outside diameter 42 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6302 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "The open 6302-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6302 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6302-NSK drags the lip and overheats it.",
      "The open 6302 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 15 mm bore the 6302 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "NSK rates 6302 at 12.6 kN dynamic (C) and 5.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — for conveying or gearbox duty with shock loads, verify the equivalent dynamic load stays well below C.",
      "At 83 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 12.6/5.45 kN load ratings, mass 83 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6302 on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6302; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6302-NSK bearing?",
        "a": "A 6302-NSK deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6302-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6302-NSK need?",
        "a": "The open 6302-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6302?",
        "a": "NSK lists the open 6302 under the bare designation 6302; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 15 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6302 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6302-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6302-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6302",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6302",
      "NSK 6302",
      "6302-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6303-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6303DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 6.65,
    "weight_g": 113,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6303-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6303DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 17 mm bore the ring mass is significant: heat 6303 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6217.",
      "Contact seals add drag and heat: 6303-2RS runs slower and cooler-limited than the open 6303; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6303-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6303DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 17 mm bore the 6303 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 15 kN dynamic load rating (C) and 6.65 kN static (C0), 6303 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 113 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15/6.65 kN load ratings, mass 113 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6303DDU on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6303; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6303-2RS bearing?",
        "a": "A 6303-2RS deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6303-2RS need?",
        "a": "6303-2RS is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6303 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6303 bore code work?",
        "a": "The last two digits of 6303 are bore code 17, giving 17 × 5 = 17 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6303?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6303DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×47×14 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6303DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6303-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6303-2RS",
      "6303-2rs",
      "6303DDU",
      "NSK 6303DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6303-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6303VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 6.65,
    "weight_g": 113,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6303 carries bore code 17 = 17 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6303VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 6303-RSR-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6217.",
      "RSR low-friction seals on 6303-RSR-NSK run faster than contact-seal 6303-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6303-2RS instead.",
      "The non-contact lip of 6303-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 17 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6303-RSR-NSK.",
      "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues this low-friction non-contact seal as 6303VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 17 mm bore the 6303 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 15 kN dynamic load rating (C) and 6.65 kN static (C0), 6303 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 113 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15/6.65 kN load ratings, mass 113 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6303VV on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6303; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6303-RSR-NSK bearing?",
        "a": "A 6303-RSR-NSK deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6303 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6303 uses the same ISO 15 envelope (17×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6303-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6303-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6303 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6303?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6303VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×47×14 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6303 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6303-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6303-RSR",
      "6303-rsr",
      "6303VV",
      "NSK 6303VV",
      "6303-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6303-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6303ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 6.65,
    "weight_g": 113,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6303-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6303ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 6303-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6303-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6303-2RS for that.",
      "Do not wash 6303-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "The housing bore for the 47 mm OD should be round within IT7; an oval bore pinches the outer ring of 6303-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6303-ZZ-NSK.",
      "NSK catalogues the shielded version as 6303ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 17 mm bore the 6303 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 15 kN dynamic load rating (C) and 6.65 kN static (C0), 6303 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 113 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15/6.65 kN load ratings, mass 113 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6303ZZ on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6303-ZZ-NSK bearing?",
        "a": "A 6303-ZZ-NSK deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 17 mm bore?",
        "a": "The '3' is the medium diameter series: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6303 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6303 uses the same ISO 15 envelope (17×47×14 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6303?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6303ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 17×47×14 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6303ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6303-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6303-ZZ",
      "6303-zz",
      "6303ZZ",
      "NSK 6303ZZ",
      "6303-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6303-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6303",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 15,
    "static_load_kN": 6.65,
    "weight_g": 113,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6303 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 17 mm of 6303-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6217.",
      "Storage matters for open bearings: 6303-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6303 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 47 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6303-NSK.",
      "The open 6303 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 17 mm bore the 6303 sits in NSK's small-bore range; NSK ships these sizes with a pressed-steel cage and P0 tolerance as standard, and NSK's EA (extra-precision) or P5 class is a special-order upgrade for spindle duty — do not assume catalogue P0 figures hold for instrument use without an NSK engineering check.",
      "At 15 kN dynamic load rating (C) and 6.65 kN static (C0), 6303 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 113 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 15/6.65 kN load ratings, mass 113 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6303 on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6303-NSK bearing?",
        "a": "A 6303-NSK deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6303 bore code work?",
        "a": "The last two digits of 6303 are bore code 17, giving 17 × 5 = 17 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6303 mean?",
        "a": "A bare 6303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 6303?",
        "a": "NSK lists the open 6303 under the bare designation 6303; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 17 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6303?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6303-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6303-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6303",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6303",
      "NSK 6303",
      "6303-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6304DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 7.9,
    "weight_g": 145,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6304DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.",
      "Heat is the enemy of the sealed 6304-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6304-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "The housing bore for the 52 mm OD should be round within IT7; an oval bore pinches the outer ring of 6304-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6304DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 20 mm bore puts 6304 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.5 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 145 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 17.5/7.9 kN load ratings, mass 145 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6304DDU on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6304; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6304 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-2RS-NSK bearing?",
        "a": "A 6304-2RS-NSK deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6300 compare with other series at the same 20 mm bore?",
        "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6304 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6304?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6304DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×52×15 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6304DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304-2RS",
      "6304-2rs",
      "6304DDU",
      "NSK 6304DDU",
      "6304-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6304VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 7.9,
    "weight_g": 145,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6304VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 20 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6304-RSR-NSK.",
      "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.",
      "The low-drag lip of 6304-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6304-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 20 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6304-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6304VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 20 mm bore puts 6304 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.5 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 145 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 17.5/7.9 kN load ratings, mass 145 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6304VV on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-RSR-NSK bearing?",
        "a": "A 6304-RSR-NSK deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6304 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6304-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6304-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6304 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6304?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6304VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×52×15 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6304VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304-RSR",
      "6304-rsr",
      "6304VV",
      "NSK 6304VV",
      "6304-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6304ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 7.9,
    "weight_g": 145,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6304-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 04 by five gives the 20 mm bore; the 52 mm outside diameter and 15 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 20 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6304ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 20 mm bore through a 52 mm OD and 15 mm width; the heavier rolling elements also trade away some speed versus a 6204.",
      "Do not wash 6304-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6304-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Measure the shaft, do not trust the drawing: a 20 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6304-ZZ-NSK.",
      "NSK catalogues the shielded version as 6304ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 20 mm bore puts 6304 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.5 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 145 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 17.5/7.9 kN load ratings, mass 145 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6304ZZ on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-ZZ-NSK bearing?",
        "a": "A 6304-ZZ-NSK deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6304-ZZ-NSK need?",
        "a": "6304-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6304 bore code work?",
        "a": "The last two digits of 6304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6304?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6304ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 20×52×15 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6304ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304-ZZ",
      "6304-zz",
      "6304ZZ",
      "NSK 6304ZZ",
      "6304-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6304-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6304",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 17.5,
    "static_load_kN": 7.9,
    "weight_g": 145,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 20 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "A 20 mm shaft for 6304 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 20 mm bore gains dynamic rating through larger rolling elements on a 52 mm OD; the penalty is mass and a lower limiting speed than the 6204 — do not specify it for speed-critical shafts.",
      "The open 6304-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6304-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 52 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6304-NSK.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6304 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 20 mm bore puts 6304 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 17.5 kN dynamic load rating (C) and 7.9 kN static (C0), 6304 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 145 g, 6304 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.",
      "The 20×52×15 mm envelope of 6304 gives a D/d ratio of 2.60 and 16.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 17.5/7.9 kN load ratings, mass 145 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6304 on the 20×52×15 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6304 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6304; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6304-NSK bearing?",
        "a": "A 6304-NSK deep-groove ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 20 mm bore?",
        "a": "The '3' is the medium diameter series: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 6204 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6304 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6304 uses the same ISO 15 envelope (20×52×15 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6304?",
        "a": "NSK lists the open 6304 under the bare designation 6304; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 20 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6304 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6304",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6304",
      "NSK 6304",
      "6304-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6305DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 22.6,
    "static_load_kN": 11.2,
    "weight_g": 235,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6305DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6305 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.",
      "Heat is the enemy of the sealed 6305-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6305-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 17 mm-wide ring of 6305-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6305DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 25 mm bore puts 6305 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 22.6 kN dynamic load rating (C) and 11.2 kN static (C0), 6305 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 235 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22.6/11.2 kN load ratings, mass 235 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6305DDU on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-2RS-NSK bearing?",
        "a": "A 6305-2RS-NSK deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6305-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 25 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6305-2RS-NSK need?",
        "a": "6305-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6305 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6305?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6305DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×62×17 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6305 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305-2RS",
      "6305-2rs",
      "6305DDU",
      "NSK 6305DDU",
      "6305-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6305VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 22.6,
    "static_load_kN": 11.2,
    "weight_g": 235,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6305VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 25 mm shaft for 6305 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.",
      "RSR low-friction seals on 6305-RSR-NSK run faster than contact-seal 6305-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6305-2RS instead.",
      "The non-contact lip of 6305-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 25 mm bore position before relying on it as sealed-for-life.",
      "Never mix components between two 6305-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6305VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 25 mm bore puts 6305 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 22.6 kN dynamic load rating (C) and 11.2 kN static (C0), 6305 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 235 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22.6/11.2 kN load ratings, mass 235 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6305VV on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6305; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6305 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-RSR-NSK bearing?",
        "a": "A 6305-RSR-NSK deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6305 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6305 uses the same ISO 15 envelope (25×62×17 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6305-RSR-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6305-RSR-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6305 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6305?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6305VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×62×17 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6305VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305-RSR",
      "6305-rsr",
      "6305VV",
      "NSK 6305VV",
      "6305-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6305ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 22.6,
    "static_load_kN": 11.2,
    "weight_g": 235,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6305ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-ZZ-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium section at 25 mm bore gains dynamic rating through larger rolling elements on a 62 mm OD; the penalty is mass and a lower limiting speed than the 6205 — do not specify it for speed-critical shafts.",
      "Do not wash 6305-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6305-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 25 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6305-ZZ-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the shielded version as 6305ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 25 mm bore puts 6305 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 22.6 kN dynamic load rating (C) and 11.2 kN static (C0), 6305 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 235 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22.6/11.2 kN load ratings, mass 235 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6305ZZ on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-ZZ-NSK bearing?",
        "a": "A 6305-ZZ-NSK deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6305 bore code work?",
        "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6305-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6305?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6305ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 25×62×17 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6305ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305-ZZ",
      "6305-zz",
      "6305ZZ",
      "NSK 6305ZZ",
      "6305-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6305-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6305",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 22.6,
    "static_load_kN": 11.2,
    "weight_g": 235,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 25 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6305-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium series gains rating at 25 mm bore through a 62 mm OD and 17 mm width; the heavier rolling elements also trade away some speed versus a 6205.",
      "The open 6305-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6305 units.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Vibration during standstill brinells the raceways of a 25 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6305 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 25 mm bore puts 6305 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 22.6 kN dynamic load rating (C) and 11.2 kN static (C0), 6305 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 235 g, 6305 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 25×62×17 mm envelope of 6305 gives a D/d ratio of 2.48 and 18.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 22.6/11.2 kN load ratings, mass 235 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6305 on the 25×62×17 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6305 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6305-NSK bearing?",
        "a": "A 6305-NSK deep-groove ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6305 bore code work?",
        "a": "The last two digits of 6305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6305 mean?",
        "a": "A bare 6305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 6305?",
        "a": "NSK lists the open 6305 under the bare designation 6305; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 25 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6305?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "305-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×17 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6305",
      "NSK 6305",
      "6305-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6306DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 29.3,
    "static_load_kN": 15,
    "weight_g": 345,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6306-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6306DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-2RS-NSK.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6306-2RS-NSK runs slower and cooler-limited than the open 6306; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6306-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Vibration during standstill brinells the raceways of a 30 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 19 mm-wide ring of 6306-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6306DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 30 mm bore puts 6306 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 29.3 kN dynamic load rating (C) and 15 kN static (C0), 6306 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 345 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 29.3/15 kN load ratings, mass 345 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6306DDU on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-2RS-NSK bearing?",
        "a": "A 6306-2RS-NSK deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6306-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6306-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6306 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6306-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6306?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6306DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×72×19 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6306DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306-2RS",
      "6306-2rs",
      "6306DDU",
      "NSK 6306DDU",
      "6306-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6306VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 29.3,
    "static_load_kN": 15,
    "weight_g": 345,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6306-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 72 mm outside diameter and 19 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6306VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Sizes around 30 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6306-RSR-NSK.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6306-RSR-NSK run faster than contact-seal 6306-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6306-2RS instead.",
      "The non-contact lip of 6306-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 30 mm bore position before relying on it as sealed-for-life.",
      "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Never mix components between two 6306-RSR-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues this low-friction non-contact seal as 6306VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 30 mm bore puts 6306 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 29.3 kN dynamic load rating (C) and 15 kN static (C0), 6306 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 345 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 29.3/15 kN load ratings, mass 345 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6306VV on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6306 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-RSR-NSK bearing?",
        "a": "A 6306-RSR-NSK deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6306-RSR-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6306-RSR-NSK need?",
        "a": "6306-RSR-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6306 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6306?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6306VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×72×19 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6306 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306-RSR",
      "6306-rsr",
      "6306VV",
      "NSK 6306VV",
      "6306-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6306ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 29.3,
    "static_load_kN": 15,
    "weight_g": 345,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6306ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "agricultural equipment",
      "fans and blowers",
      "electric motors",
      "centrifugal pumps"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6306 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6306-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6306-2RS for that.",
      "Shielded 6306-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "The housing bore for the 72 mm OD should be round within IT7; an oval bore pinches the outer ring of 6306-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6306-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6306ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 30 mm bore puts 6306 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 29.3 kN dynamic load rating (C) and 15 kN static (C0), 6306 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 345 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 29.3/15 kN load ratings, mass 345 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6306ZZ on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6306 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-ZZ-NSK bearing?",
        "a": "A 6306-ZZ-NSK deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6306-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 30 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6306-ZZ-NSK need?",
        "a": "6306-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6306?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6306ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 30×72×19 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6306ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306-ZZ",
      "6306-zz",
      "6306ZZ",
      "NSK 6306ZZ",
      "6306-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6306-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6306",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 29.3,
    "static_load_kN": 15,
    "weight_g": 345,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 30 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 30 mm shaft for 6306 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 30 mm bore gains dynamic rating through larger rolling elements on a 72 mm OD; the penalty is mass and a lower limiting speed than the 6206 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6306-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6306 units.",
      "Never mix components between two 6306-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6306 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 30 mm bore puts 6306 in NSK's light industrial range; the standard pressed-steel cage and CN clearance cover most fractional-horsepower motor and small-pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "At 29.3 kN dynamic load rating (C) and 15 kN static (C0), 6306 is a medium-load NSK bearing suitable for most electric-motor and pump duty; the C0/C0r ratio matters for preloaded or thrust-loaded arrangements, so confirm the static safety factor with the NSK catalogue.",
      "At 345 g, 6306 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 30×72×19 mm envelope of 6306 gives a D/d ratio of 2.40 and 21.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 29.3/15 kN load ratings, mass 345 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6306 on the 30×72×19 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6306 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6306 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6306-NSK bearing?",
        "a": "A 6306-NSK deep-groove ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6306 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6306 uses the same ISO 15 envelope (30×72×19 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6306-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6306-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6306 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6306?",
        "a": "NSK lists the open 6306 under the bare designation 6306; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 30 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6306 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "306-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×19 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6306",
      "NSK 6306",
      "6306-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6307DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 19.2,
    "weight_g": 464,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6307DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 6307-2RS-NSK; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.",
      "Heat is the enemy of the sealed 6307-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6307-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the contact-sealed version as 6307DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 35 mm bore puts 6307 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6307 at 36.5 kN dynamic (C) and 19.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 464 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 36.5/19.2 kN load ratings, mass 464 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6307DDU on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-2RS-NSK bearing?",
        "a": "A 6307-2RS-NSK deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6307-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6307-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6307-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 35 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6307?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6307DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×80×21 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6307DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307-2RS",
      "6307-2rs",
      "6307DDU",
      "NSK 6307DDU",
      "6307-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6307VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 19.2,
    "weight_g": 464,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6307VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6307 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 35 mm bore through a 80 mm OD and 21 mm width; the heavier rolling elements also trade away some speed versus a 6207.",
      "RSR low-friction seals on 6307-RSR run faster than contact-seal 6307-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6307-2RS instead.",
      "The low-drag lip of 6307-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 80 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6307-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6307VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 35 mm bore puts 6307 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6307 at 36.5 kN dynamic (C) and 19.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 464 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 36.5/19.2 kN load ratings, mass 464 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6307VV on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6307 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-RSR bearing?",
        "a": "A 6307-RSR deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6307 bore code work?",
        "a": "The last two digits of 6307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6307-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6307?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6307VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×80×21 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6307 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307-RSR",
      "6307-rsr",
      "6307VV",
      "NSK 6307VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6307ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 19.2,
    "weight_g": 464,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6307-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 07 by five gives the 35 mm bore; the 80 mm outside diameter and 21 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 35 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6307ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 35 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6307-ZZ-NSK.",
      "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.",
      "Do not wash 6307-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6307-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6307-ZZ-NSK.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 21 mm-wide ring of 6307-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6307ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 35 mm bore puts 6307 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6307 at 36.5 kN dynamic (C) and 19.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 464 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 36.5/19.2 kN load ratings, mass 464 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6307ZZ on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6307 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-ZZ-NSK bearing?",
        "a": "A 6307-ZZ-NSK deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 35 mm bore?",
        "a": "The '3' is the medium diameter series: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 6207 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6307 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6307?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6307ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 35×80×21 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6307 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307-ZZ",
      "6307-zz",
      "6307ZZ",
      "NSK 6307ZZ",
      "6307-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6307-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6307",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 36.5,
    "static_load_kN": 19.2,
    "weight_g": 464,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 35 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "fans and blowers",
      "electric motors",
      "centrifugal pumps",
      "small gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "A 35 mm shaft for 6307 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 35 mm bore gains dynamic rating through larger rolling elements on a 80 mm OD; the penalty is mass and a lower limiting speed than the 6207 — do not specify it for speed-critical shafts.",
      "The open 6307-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6307 units.",
      "Measure the shaft, do not trust the drawing: a 35 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6307-NSK.",
      "Vibration during standstill brinells the raceways of a 35 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "The open 6307 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 35 mm bore puts 6307 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6307 at 36.5 kN dynamic (C) and 19.2 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 464 g, 6307 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 35×80×21 mm envelope of 6307 gives a D/d ratio of 2.29 and 22.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 36.5/19.2 kN load ratings, mass 464 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6307 on the 35×80×21 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6307 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6307 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6307-NSK bearing?",
        "a": "A 6307-NSK deep-groove ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6307 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6307 uses the same ISO 15 envelope (35×80×21 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6307-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6307-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6307 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6307?",
        "a": "NSK lists the open 6307 under the bare designation 6307; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 35 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6307 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6307-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "W6307-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "307-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×21 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6307",
      "NSK 6307",
      "6307-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6308DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 45,
    "static_load_kN": 24,
    "weight_g": 636,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6308-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 08 by five gives the 40 mm bore; the 90 mm outside diameter and 23 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 40 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6308DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.",
      "Contact seals add drag and heat: 6308-2RS-NSK runs slower and cooler-limited than the open 6308; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6308-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6308-2RS-NSK.",
      "The housing bore for the 90 mm OD should be round within IT7; an oval bore pinches the outer ring of 6308-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6308DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 40 mm bore puts 6308 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6308 at 45 kN dynamic (C) and 24 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 636 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 45/24 kN load ratings, mass 636 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6308DDU on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-2RS-NSK bearing?",
        "a": "A 6308-2RS-NSK deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6308-2RS-NSK need?",
        "a": "6308-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6308 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6308 bore code work?",
        "a": "The last two digits of 6308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6308?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6308DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×90×23 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6308 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308-2RS",
      "6308-2rs",
      "6308DDU",
      "NSK 6308DDU",
      "6308-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-RSR-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6308VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 45,
    "static_load_kN": 24,
    "weight_g": 636,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6308VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.",
      "The low-drag lip of 6308-RSR-NSK barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6308-RSR-NSK does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 40 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6308-RSR-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 90 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6308-RSR-NSK.",
      "NSK catalogues this low-friction non-contact seal as 6308VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 40 mm bore puts 6308 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6308 at 45 kN dynamic (C) and 24 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 636 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 45/24 kN load ratings, mass 636 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6308VV on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6308 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-RSR-NSK bearing?",
        "a": "A 6308-RSR-NSK deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6300 compare with other series at the same 40 mm bore?",
        "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6308 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6308 uses the same ISO 15 envelope (40×90×23 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6308?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6308VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×90×23 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6308VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308-RSR",
      "6308-rsr",
      "6308VV",
      "NSK 6308VV",
      "6308-RSR-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6308ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 45,
    "static_load_kN": 24,
    "weight_g": 636,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6308ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Sizes around 40 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6308-ZZ-NSK.",
      "The 63xx medium section at 40 mm bore gains dynamic rating through larger rolling elements on a 90 mm OD; the penalty is mass and a lower limiting speed than the 6208 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6308-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6308-2RS for that.",
      "Shielded 6308-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6308-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6308ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 40 mm bore puts 6308 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6308 at 45 kN dynamic (C) and 24 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 636 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 45/24 kN load ratings, mass 636 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6308ZZ on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6308 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-ZZ-NSK bearing?",
        "a": "A 6308-ZZ-NSK deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6308-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6300 compare with other series at the same 40 mm bore?",
        "a": "The '3' is the medium diameter series: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 6208 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the NSK suffix for a sealed 6308?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6308ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 40×90×23 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6308 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308-ZZ",
      "6308-zz",
      "6308ZZ",
      "NSK 6308ZZ",
      "6308-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6308-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6308",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 45,
    "static_load_kN": 24,
    "weight_g": 636,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 40 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "electric motors",
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "A 40 mm shaft for 6308 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 40 mm bore through a 90 mm OD and 23 mm width; the heavier rolling elements also trade away some speed versus a 6208.",
      "The open 6308-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6308 units.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Measure the shaft, do not trust the drawing: a 40 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6308-NSK.",
      "The open 6308 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 40 mm bore puts 6308 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6308 at 45 kN dynamic (C) and 24 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 636 g, 6308 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 40×90×23 mm envelope of 6308 gives a D/d ratio of 2.25 and 25.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 45/24 kN load ratings, mass 636 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6308 on the 40×90×23 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6308 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6308; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6308-NSK bearing?",
        "a": "A 6308-NSK deep-groove ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6308-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 40 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6308-NSK need?",
        "a": "The open 6308-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6308?",
        "a": "NSK lists the open 6308 under the bare designation 6308; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 40 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6308 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6308-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "308-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6308",
      "NSK 6308",
      "6308-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6309-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6309DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 32,
    "weight_g": 829,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6309DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309-2RS-NSK.",
      "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6309-2RS-NSK runs slower and cooler-limited than the open 6309; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6309-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Measure the shaft, do not trust the drawing: a 45 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6309-2RS-NSK.",
      "NSK catalogues the contact-sealed version as 6309DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 45 mm bore puts 6309 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 829 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 58.5/32 kN load ratings, mass 829 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6309DDU on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6309 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6309-2RS-NSK bearing?",
        "a": "A 6309-2RS-NSK deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6309 bore code work?",
        "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6309-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6309?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6309DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×100×25 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6309DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6309-2RS",
      "6309-2rs",
      "6309DDU",
      "NSK 6309DDU",
      "6309-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6309-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6309VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 32,
    "weight_g": 829,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6309VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6309 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6309-RSR run faster than contact-seal 6309-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6309-2RS instead.",
      "The non-contact lip of 6309-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The housing bore for the 100 mm OD should be round within IT7; an oval bore pinches the outer ring of 6309-RSR and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6309VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 45 mm bore puts 6309 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 829 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 58.5/32 kN load ratings, mass 829 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6309VV on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6309; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6309-RSR bearing?",
        "a": "A 6309-RSR deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6309-RSR need?",
        "a": "6309-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6309 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6309 bore code work?",
        "a": "The last two digits of 6309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6309?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6309VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×100×25 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6309VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6309-RSR",
      "6309-rsr",
      "6309VV",
      "NSK 6309VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6309-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6309ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 32,
    "weight_g": 829,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6309ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal pumps",
      "small gearboxes",
      "conveyors and drives",
      "agricultural equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "A 45 mm shaft for 6309 should be finished to Ra ≤ 1.6 µm with square seating faces; at this bore a scored or oval journal shows up directly as running noise and early raceway damage.",
      "The 63xx medium series gains rating at 45 mm bore through a 100 mm OD and 25 mm width; the heavier rolling elements also trade away some speed versus a 6209.",
      "ZZ shields are non-contact: 6309-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6309-2RS for that.",
      "Shielded 6309-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 25 mm-wide ring of 6309-ZZ-NSK drags the lip and overheats it.",
      "NSK catalogues the shielded version as 6309ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 45 mm bore puts 6309 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 829 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 58.5/32 kN load ratings, mass 829 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6309ZZ on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6309-ZZ-NSK bearing?",
        "a": "A 6309-ZZ-NSK deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What does the ZZ suffix on 6309-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "How does the 6300 compare with other series at the same 45 mm bore?",
        "a": "The '3' is the medium diameter series: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 6209 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the NSK suffix for a sealed 6309?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6309ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 45×100×25 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6309ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6309-ZZ",
      "6309-zz",
      "6309ZZ",
      "NSK 6309ZZ",
      "6309-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6309-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6309",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 32,
    "weight_g": 829,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6309 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 09 by five gives the 45 mm bore; the 100 mm outside diameter and 25 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 45 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyors and drives",
      "agricultural equipment",
      "fans and blowers",
      "electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Sizes around 45 mm bore are normally pressed on cold with a sleeve against the inner-ring face; the press force must never route through the outer ring or the balls of 6309-NSK.",
      "The 63xx medium section at 45 mm bore gains dynamic rating through larger rolling elements on a 100 mm OD; the penalty is mass and a lower limiting speed than the 6209 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6309-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6309 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6309 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 45 mm bore puts 6309 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6309 at 58.5 kN dynamic (C) and 32 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 829 g, 6309 requires a soft-jaw vise or arbor press for mounting — never hammer it onto the shaft, and support the opposite ring to avoid brinelling the raceways.",
      "The 45×100×25 mm envelope of 6309 gives a D/d ratio of 2.22 and 27.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 58.5/32 kN load ratings, mass 829 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6309 on the 45×100×25 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6309 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6309-NSK bearing?",
        "a": "A 6309-NSK deep-groove ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6309 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6309 uses the same ISO 15 envelope (45×100×25 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6309-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6309-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6309 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6309?",
        "a": "NSK lists the open 6309 under the bare designation 6309; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 45 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6309?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6309-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6309-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "309-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6309",
      "NSK 6309",
      "6309-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6310-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6310DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68,
    "static_load_kN": 38.5,
    "weight_g": 1060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6310DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.",
      "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.",
      "Heat is the enemy of the sealed 6310-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6310-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 6310-2RS-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the contact-sealed version as 6310DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "The 50 mm bore puts 6310 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6310 at 68 kN dynamic (C) and 38.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1060 g (1.1 kg), 6310 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 68/38.5 kN load ratings, mass 1060 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6310DDU on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6310-2RS-NSK bearing?",
        "a": "A 6310-2RS-NSK deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6310 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6310 uses the same ISO 15 envelope (50×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6310-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6310-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6310?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6310DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×110×27 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6310DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6310-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6310-2RS",
      "6310-2rs",
      "6310DDU",
      "NSK 6310DDU",
      "6310-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6310-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6310VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68,
    "static_load_kN": 38.5,
    "weight_g": 1060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6310-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 10 by five gives the 50 mm bore; the 110 mm outside diameter and 27 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 50 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6310VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6310 with C3 for those conditions.",
      "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.",
      "The low-drag lip of 6310-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6310-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 50 mm bore position before relying on it as sealed-for-life.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6310VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "The 50 mm bore puts 6310 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6310 at 68 kN dynamic (C) and 38.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1060 g (1.1 kg), 6310 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 68/38.5 kN load ratings, mass 1060 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6310VV on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6310; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6310-RSR bearing?",
        "a": "A 6310-RSR deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6300 compare with other series at the same 50 mm bore?",
        "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6310 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6310 uses the same ISO 15 envelope (50×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6310?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6310VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×110×27 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6310VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6310-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6310-RSR",
      "6310-rsr",
      "6310VV",
      "NSK 6310VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6310-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6310ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68,
    "static_load_kN": 38.5,
    "weight_g": 1060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6310ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6310 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium series gains rating at 50 mm bore through a 110 mm OD and 27 mm width; the heavier rolling elements also trade away some speed versus a 6210.",
      "ZZ shields are non-contact: 6310-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6310-2RS for that.",
      "Shielded 6310-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 50 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6310-ZZ-NSK.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 110 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6310-ZZ-NSK.",
      "NSK catalogues the shielded version as 6310ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 50 mm bore puts 6310 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6310 at 68 kN dynamic (C) and 38.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1060 g (1.1 kg), 6310 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 68/38.5 kN load ratings, mass 1060 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6310ZZ on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6310 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6310-ZZ-NSK bearing?",
        "a": "A 6310-ZZ-NSK deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 50 mm bore?",
        "a": "The '3' is the medium diameter series: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6310 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6310 uses the same ISO 15 envelope (50×110×27 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6310?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6310ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 50×110×27 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6310ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6310-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6310-ZZ",
      "6310-zz",
      "6310ZZ",
      "NSK 6310ZZ",
      "6310-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6310-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6310",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 68,
    "static_load_kN": 38.5,
    "weight_g": 1060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 50 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 50 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6310 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 50 mm bore gains dynamic rating through larger rolling elements on a 110 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6310-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6310 units.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6310-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6310 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 50 mm bore puts 6310 in NSK's general-purpose industrial range; the standard pressed-steel cage and CN clearance cover most electric-motor and pump duty. NSK's VV non-contact seal is the high-speed choice here — DDU contact seal costs roughly 30–40% of the open-bearing speed ceiling.",
      "NSK rates 6310 at 68 kN dynamic (C) and 38.5 kN static (C0); this upper-medium rating covers conveyor and gearbox drives, but at these loads the pressed-steel cage can be the limiting factor under shock — consider the machined brass cage (suffix M) for impact duty.",
      "At 1060 g (1.1 kg), 6310 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 50×110×27 mm envelope of 6310 gives a D/d ratio of 2.20 and 30.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 68/38.5 kN load ratings, mass 1060 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6310 on the 50×110×27 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6310 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6310; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6310-NSK bearing?",
        "a": "A 6310-NSK deep-groove ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6310-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6310-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6310 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6310-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 50 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6310?",
        "a": "NSK lists the open 6310 under the bare designation 6310; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 50 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6310 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6310-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6310-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "310-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6310",
      "NSK 6310",
      "6310-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6311DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 78.5,
    "static_load_kN": 44.5,
    "weight_g": 1370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6311-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6311DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium series gains rating at 55 mm bore through a 120 mm OD and 29 mm width; the heavier rolling elements also trade away some speed versus a 6211.",
      "Contact seals add drag and heat: 6311-2RS-NSK runs slower and cooler-limited than the open 6311; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6311-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues the contact-sealed version as 6311DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 55 mm bore 6311 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 78.5 kN dynamic load rating (C) and 44.5 kN static (C0), 6311 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 78.5/44.5 kN load ratings, mass 1370 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6311DDU on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-2RS-NSK bearing?",
        "a": "A 6311-2RS-NSK deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6311 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6311 uses the same ISO 15 envelope (55×120×29 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6311-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6311-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6311?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6311DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×120×29 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6311DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311-2RS",
      "6311-2rs",
      "6311DDU",
      "NSK 6311DDU",
      "6311-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6311VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 78.5,
    "static_load_kN": 44.5,
    "weight_g": 1370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6311VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6311-RSR run faster than contact-seal 6311-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6311-2RS instead.",
      "The low-drag lip of 6311-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Measure the shaft, do not trust the drawing: a 55 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6311-RSR.",
      "NSK catalogues this low-friction non-contact seal as 6311VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 55 mm bore 6311 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 78.5 kN dynamic load rating (C) and 44.5 kN static (C0), 6311 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 78.5/44.5 kN load ratings, mass 1370 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6311VV on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-RSR bearing?",
        "a": "A 6311-RSR deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6311-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6311-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6311-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6311?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6311VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×120×29 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6311VV?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311-RSR",
      "6311-rsr",
      "6311VV",
      "NSK 6311VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6311ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 78.5,
    "static_load_kN": 44.5,
    "weight_g": 1370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6311-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 11 by five gives the 55 mm bore; the 120 mm outside diameter and 29 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 55 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6311ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 55 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6311 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6311-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6311-2RS for that.",
      "Shielded 6311-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues the shielded version as 6311ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 55 mm bore 6311 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 78.5 kN dynamic load rating (C) and 44.5 kN static (C0), 6311 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 78.5/44.5 kN load ratings, mass 1370 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6311ZZ on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-ZZ-NSK bearing?",
        "a": "A 6311-ZZ-NSK deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6311-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6311-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6311 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6311-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 55 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6311?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6311ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 55×120×29 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6311ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311-ZZ",
      "6311-zz",
      "6311ZZ",
      "NSK 6311ZZ",
      "6311-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6311-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6311",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 78.5,
    "static_load_kN": 44.5,
    "weight_g": 1370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 55 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "conveyor drives",
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 55 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6311 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 55 mm bore gains dynamic rating through larger rolling elements on a 120 mm OD; the penalty is mass and a lower limiting speed than the 6211 — do not specify it for speed-critical shafts.",
      "The open 6311-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6311 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 120 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6311-NSK.",
      "Never mix components between two 6311-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6311 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 55 mm bore 6311 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 78.5 kN dynamic load rating (C) and 44.5 kN static (C0), 6311 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1370 g (1.4 kg), 6311 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 55×120×29 mm envelope of 6311 gives a D/d ratio of 2.18 and 32.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 78.5/44.5 kN load ratings, mass 1370 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6311 on the 55×120×29 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6311 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6311 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6311-NSK bearing?",
        "a": "A 6311-NSK deep-groove ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6311 bore code work?",
        "a": "The last two digits of 6311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does no suffix on 6311 mean?",
        "a": "A bare 6311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "What is the NSK order number for an open 6311?",
        "a": "NSK lists the open 6311 under the bare designation 6311; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 55 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6311 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6311-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6311-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "311-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6311",
      "NSK 6311",
      "6311-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6312-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6312DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 52,
    "weight_g": 1720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6312-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 60 mm bore; the 130 mm outside diameter and 31 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 60 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6312DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "material-handling equipment",
      "industrial fans",
      "industrial electric motors",
      "centrifugal and positive-displacement pumps"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6312 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 60 mm bore gains dynamic rating through larger rolling elements on a 130 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6312-2RS-NSK runs slower and cooler-limited than the open 6312; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6312-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6312-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the contact-sealed version as 6312DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 60 mm bore 6312 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 90 kN dynamic load rating (C) and 52 kN static (C0), 6312 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1720 g (1.7 kg), 6312 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 90/52 kN load ratings, mass 1720 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6312DDU on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6312; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6312-2RS-NSK bearing?",
        "a": "A 6312-2RS-NSK deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6312-2RS-NSK need?",
        "a": "6312-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6312 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6312 bore code work?",
        "a": "The last two digits of 6312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6312?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6312DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×130×31 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6312DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6312-2RS",
      "6312-2rs",
      "6312DDU",
      "NSK 6312DDU",
      "6312-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6312-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6312VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 52,
    "weight_g": 1720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6312VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6312 with C3 for those conditions.",
      "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.",
      "The low-drag lip of 6312-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6312-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 60 mm bore position before relying on it as sealed-for-life.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues this low-friction non-contact seal as 6312VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 60 mm bore 6312 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 90 kN dynamic load rating (C) and 52 kN static (C0), 6312 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1720 g (1.7 kg), 6312 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 90/52 kN load ratings, mass 1720 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6312VV on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6312 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6312-RSR bearing?",
        "a": "A 6312-RSR deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6312 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6312 uses the same ISO 15 envelope (60×130×31 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6312-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6312-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6312 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6312?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6312VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×130×31 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6312 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6312-RSR",
      "6312-rsr",
      "6312VV",
      "NSK 6312VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6312-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6312ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 52,
    "weight_g": 1720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6312ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Interference on a 60 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6312 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.",
      "Do not wash 6312-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6312-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 130 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6312-ZZ-NSK.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6312-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6312ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 60 mm bore 6312 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 90 kN dynamic load rating (C) and 52 kN static (C0), 6312 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1720 g (1.7 kg), 6312 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 90/52 kN load ratings, mass 1720 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6312ZZ on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6312-ZZ-NSK bearing?",
        "a": "A 6312-ZZ-NSK deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6312-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6312-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6312 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6312-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6312?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6312ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 60×130×31 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6312 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6312-ZZ",
      "6312-zz",
      "6312ZZ",
      "NSK 6312ZZ",
      "6312-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6312-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6312",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 90,
    "static_load_kN": 52,
    "weight_g": 1720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 60 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 60 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6312 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium series gains rating at 60 mm bore through a 130 mm OD and 31 mm width; the heavier rolling elements also trade away some speed versus a 6212.",
      "Storage matters for open bearings: 6312-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6312 units.",
      "Never mix components between two 6312-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The housing bore for the 130 mm OD should be round within IT7; an oval bore pinches the outer ring of 6312-NSK and shows up later as two-point loaded raceway wear.",
      "The open 6312 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 60 mm bore 6312 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 90 kN dynamic load rating (C) and 52 kN static (C0), 6312 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 1720 g (1.7 kg), 6312 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 60×130×31 mm envelope of 6312 gives a D/d ratio of 2.17 and 35.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 90/52 kN load ratings, mass 1720 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6312 on the 60×130×31 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6312 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6312; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6312-NSK bearing?",
        "a": "A 6312-NSK deep-groove ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6312-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6312-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6312 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6312-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 60 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6312?",
        "a": "NSK lists the open 6312 under the bare designation 6312; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 60 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6312 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6312-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6312-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "312-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6312",
      "NSK 6312",
      "6312-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6313-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6313DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 102,
    "static_load_kN": 60,
    "weight_g": 2110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6313-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6313DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6313 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6313-2RS-NSK runs slower and cooler-limited than the open 6313; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6313-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The housing bore for the 140 mm OD should be round within IT7; an oval bore pinches the outer ring of 6313-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6313DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 65 mm bore 6313 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 102 kN dynamic load rating (C) and 60 kN static (C0), 6313 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2110 g (2.1 kg), 6313 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 102/60 kN load ratings, mass 2110 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6313DDU on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6313; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6313-2RS-NSK bearing?",
        "a": "A 6313-2RS-NSK deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6300 compare with other series at the same 65 mm bore?",
        "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6313 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6313?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6313DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×140×33 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6313DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6313-2RS",
      "6313-2rs",
      "6313DDU",
      "NSK 6313DDU",
      "6313-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6313-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6313VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 102,
    "static_load_kN": 60,
    "weight_g": 2110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 65 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6313VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Interference on a 65 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6313 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 65 mm bore gains dynamic rating through larger rolling elements on a 140 mm OD; the penalty is mass and a lower limiting speed than the 6213 — do not specify it for speed-critical shafts.",
      "The low-drag lip of 6313-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6313-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 65 mm bore position before relying on it as sealed-for-life.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "NSK catalogues this low-friction non-contact seal as 6313VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 65 mm bore 6313 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 102 kN dynamic load rating (C) and 60 kN static (C0), 6313 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2110 g (2.1 kg), 6313 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 102/60 kN load ratings, mass 2110 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6313VV on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6313; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6313-RSR bearing?",
        "a": "A 6313-RSR deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6313 bore code work?",
        "a": "The last two digits of 6313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6313-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6313?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6313VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×140×33 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6313VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6313-RSR",
      "6313-rsr",
      "6313VV",
      "NSK 6313VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6313-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6313ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 102,
    "static_load_kN": 60,
    "weight_g": 2110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6313-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6313ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.",
      "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.",
      "Do not wash 6313-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6313-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6313-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6313ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 65 mm bore 6313 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 102 kN dynamic load rating (C) and 60 kN static (C0), 6313 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2110 g (2.1 kg), 6313 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 102/60 kN load ratings, mass 2110 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6313ZZ on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6313; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6313-ZZ-NSK bearing?",
        "a": "A 6313-ZZ-NSK deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 65 mm bore?",
        "a": "The '3' is the medium diameter series: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 6213 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6313 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6313 uses the same ISO 15 envelope (65×140×33 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6313?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6313ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 65×140×33 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6313ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6313-ZZ",
      "6313-zz",
      "6313ZZ",
      "NSK 6313ZZ",
      "6313-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6313-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6313",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 102,
    "static_load_kN": 60,
    "weight_g": 2110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6313 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 13 by five gives the 65 mm bore; the 140 mm outside diameter and 33 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 65 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6313 with C3 for those conditions.",
      "The 63xx medium series gains rating at 65 mm bore through a 140 mm OD and 33 mm width; the heavier rolling elements also trade away some speed versus a 6213.",
      "Storage matters for open bearings: 6313-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6313 units.",
      "Never mix components between two 6313-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6313 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 65 mm bore 6313 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 102 kN dynamic load rating (C) and 60 kN static (C0), 6313 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2110 g (2.1 kg), 6313 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 65×140×33 mm envelope of 6313 gives a D/d ratio of 2.15 and 37.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 102/60 kN load ratings, mass 2110 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6313 on the 65×140×33 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6313 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6313-NSK bearing?",
        "a": "A 6313-NSK deep-groove ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6313-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 65 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6313-NSK need?",
        "a": "The open 6313-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6313?",
        "a": "NSK lists the open 6313 under the bare designation 6313; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 65 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6313?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6313-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6313-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "313-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6313",
      "NSK 6313",
      "6313-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6314-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6314DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 115,
    "static_load_kN": 68,
    "weight_g": 2570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6314DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial electric motors",
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6314 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.",
      "Contact seals add drag and heat: 6314-2RS-NSK runs slower and cooler-limited than the open 6314; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6314-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 150 mm OD should be round within IT7; an oval bore pinches the outer ring of 6314-2RS-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the contact-sealed version as 6314DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 70 mm bore 6314 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 115 kN dynamic load rating (C) and 68 kN static (C0), 6314 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2570 g (2.6 kg), 6314 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 115/68 kN load ratings, mass 2570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6314DDU on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6314-2RS-NSK bearing?",
        "a": "A 6314-2RS-NSK deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6314-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6314-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6314 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6314-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6314?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6314DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×150×35 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6314 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6314-2RS",
      "6314-2rs",
      "6314DDU",
      "NSK 6314DDU",
      "6314-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6314-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6314VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 115,
    "static_load_kN": 68,
    "weight_g": 2570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6314VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Interference on a 70 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6314 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 70 mm bore gains dynamic rating through larger rolling elements on a 150 mm OD; the penalty is mass and a lower limiting speed than the 6214 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6314-RSR run faster than contact-seal 6314-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6314-2RS instead.",
      "The low-drag lip of 6314-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6314-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6314VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 70 mm bore 6314 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 115 kN dynamic load rating (C) and 68 kN static (C0), 6314 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2570 g (2.6 kg), 6314 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 115/68 kN load ratings, mass 2570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6314VV on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6314-RSR bearing?",
        "a": "A 6314-RSR deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6314-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6314-RSR need?",
        "a": "6314-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6314 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6314?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6314VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×150×35 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6314 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6314-RSR",
      "6314-rsr",
      "6314VV",
      "NSK 6314VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6314-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6314ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 115,
    "static_load_kN": 68,
    "weight_g": 2570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 70 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6314ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.",
      "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.",
      "ZZ shields are non-contact: 6314-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6314-2RS for that.",
      "Do not wash 6314-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 35 mm-wide ring of 6314-ZZ-NSK drags the lip and overheats it.",
      "Vibration during standstill brinells the raceways of a 70 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the shielded version as 6314ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 70 mm bore 6314 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 115 kN dynamic load rating (C) and 68 kN static (C0), 6314 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2570 g (2.6 kg), 6314 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 115/68 kN load ratings, mass 2570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6314ZZ on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6314; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6314-ZZ-NSK bearing?",
        "a": "A 6314-ZZ-NSK deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 70 mm bore?",
        "a": "The '3' is the medium diameter series: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 6214 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6314 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6314 uses the same ISO 15 envelope (70×150×35 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6314?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6314ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 70×150×35 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6314 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6314-ZZ",
      "6314-zz",
      "6314ZZ",
      "NSK 6314ZZ",
      "6314-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6314-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6314",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 115,
    "static_load_kN": 68,
    "weight_g": 2570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6314 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 14 by five gives the 70 mm bore; the 150 mm outside diameter and 35 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 70 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6314 with C3 for those conditions.",
      "The 63xx medium series gains rating at 70 mm bore through a 150 mm OD and 35 mm width; the heavier rolling elements also trade away some speed versus a 6214.",
      "The open 6314-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6314-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6314 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 70 mm bore 6314 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 115 kN dynamic load rating (C) and 68 kN static (C0), 6314 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 2570 g (2.6 kg), 6314 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 70×150×35 mm envelope of 6314 gives a D/d ratio of 2.14 and 40.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 115/68 kN load ratings, mass 2570 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6314 on the 70×150×35 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6314 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6314 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6314-NSK bearing?",
        "a": "A 6314-NSK deep-groove ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6314-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 70 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6314-NSK need?",
        "a": "The open 6314-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6314?",
        "a": "NSK lists the open 6314 under the bare designation 6314; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 70 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6314 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6314-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6314-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "314-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6314",
      "NSK 6314",
      "6314-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6315-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6315DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 125,
    "static_load_kN": 77,
    "weight_g": 3080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6315-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6315DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6315 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6315-2RS-NSK runs slower and cooler-limited than the open 6315; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6315-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6315-2RS-NSK.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 37 mm-wide ring of 6315-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6315DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 75 mm bore 6315 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 125 kN dynamic load rating (C) and 77 kN static (C0), 6315 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3080 g (3.1 kg), 6315 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 125/77 kN load ratings, mass 3080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6315DDU on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6315; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6315-2RS-NSK bearing?",
        "a": "A 6315-2RS-NSK deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "Are 6315 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6315 uses the same ISO 15 envelope (75×160×37 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6315-2RS-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6315-2RS-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6315 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6315?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6315DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×160×37 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6315DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6315-2RS",
      "6315-2rs",
      "6315DDU",
      "NSK 6315DDU",
      "6315-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6315-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6315VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 125,
    "static_load_kN": 77,
    "weight_g": 3080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6315-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6315VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment",
      "industrial fans"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 75 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6315 against the shaft shoulder while it cools so the ring cannot creep back.",
      "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6315-RSR run faster than contact-seal 6315-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6315-2RS instead.",
      "The low-drag lip of 6315-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Vibration during standstill brinells the raceways of a 75 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "NSK catalogues this low-friction non-contact seal as 6315VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 75 mm bore 6315 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 125 kN dynamic load rating (C) and 77 kN static (C0), 6315 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3080 g (3.1 kg), 6315 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 125/77 kN load ratings, mass 3080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6315VV on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6315 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6315-RSR bearing?",
        "a": "A 6315-RSR deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6315 bore code work?",
        "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the RSR suffix on 6315-RSR mean?",
        "a": "RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments."
      },
      {
        "q": "What is the NSK suffix for a sealed 6315?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6315VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×160×37 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6315VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6315-RSR",
      "6315-rsr",
      "6315VV",
      "NSK 6315VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6315-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6315ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 125,
    "static_load_kN": 77,
    "weight_g": 3080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6315-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 75 mm bore; the 160 mm outside diameter and 37 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 75 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6315ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6315 with C3 for those conditions.",
      "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6315-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6315-2RS for that.",
      "Shielded 6315-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "The housing bore for the 160 mm OD should be round within IT7; an oval bore pinches the outer ring of 6315-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 160 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6315-ZZ-NSK.",
      "NSK catalogues the shielded version as 6315ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 75 mm bore 6315 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 125 kN dynamic load rating (C) and 77 kN static (C0), 6315 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3080 g (3.1 kg), 6315 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 125/77 kN load ratings, mass 3080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6315ZZ on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6315 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6315-ZZ-NSK bearing?",
        "a": "A 6315-ZZ-NSK deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6315 bore code work?",
        "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6315-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6315?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6315ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 75×160×37 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6315ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6315-ZZ",
      "6315-zz",
      "6315ZZ",
      "NSK 6315ZZ",
      "6315-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6315-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6315",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 125,
    "static_load_kN": 77,
    "weight_g": 3080,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 75 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "centrifugal and positive-displacement pumps",
      "gearboxes and speed reducers",
      "conveyor drives",
      "material-handling equipment"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Interference on a 75 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6315 with C3 clearance and re-check the residual value after mounting.",
      "The 63xx medium section at 75 mm bore gains dynamic rating through larger rolling elements on a 160 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.",
      "The open 6315-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6315 units.",
      "Measure the shaft, do not trust the drawing: a 75 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6315-NSK.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "The open 6315 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 75 mm bore 6315 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 125 kN dynamic load rating (C) and 77 kN static (C0), 6315 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3080 g (3.1 kg), 6315 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 75×160×37 mm envelope of 6315 gives a D/d ratio of 2.13 and 42.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 125/77 kN load ratings, mass 3080 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6315 on the 75×160×37 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6315 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6315 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6315-NSK bearing?",
        "a": "A 6315-NSK deep-groove ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6315-NSK need?",
        "a": "The open 6315-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6315 bore code work?",
        "a": "The last two digits of 6315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6315?",
        "a": "NSK lists the open 6315 under the bare designation 6315; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 75 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6315 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6315-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6315-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "315-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6315",
      "NSK 6315",
      "6315-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6316-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6316DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 135,
    "static_load_kN": 86.5,
    "weight_g": 3670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6316DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.",
      "Heat is the enemy of the sealed 6316-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6316-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6316DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 80 mm bore 6316 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 135 kN dynamic load rating (C) and 86.5 kN static (C0), 6316 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3670 g (3.7 kg), 6316 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 135/86.5 kN load ratings, mass 3670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6316DDU on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6316-2RS-NSK bearing?",
        "a": "A 6316-2RS-NSK deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6316 bore code work?",
        "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the 2RS suffix on 6316-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "What is the NSK suffix for a sealed 6316?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6316DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×170×39 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6316 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6316-2RS",
      "6316-2rs",
      "6316DDU",
      "NSK 6316DDU",
      "6316-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6316-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6316VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 135,
    "static_load_kN": 86.5,
    "weight_g": 3670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6316-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 16 by five gives the 80 mm bore; the 170 mm outside diameter and 39 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 80 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6316VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6316-RSR run faster than contact-seal 6316-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6316-2RS instead.",
      "The low-drag lip of 6316-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6316-RSR.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6316-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues this low-friction non-contact seal as 6316VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 80 mm bore 6316 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 135 kN dynamic load rating (C) and 86.5 kN static (C0), 6316 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3670 g (3.7 kg), 6316 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 135/86.5 kN load ratings, mass 3670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6316VV on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6316 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6316-RSR bearing?",
        "a": "A 6316-RSR deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How does the 6300 compare with other series at the same 80 mm bore?",
        "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6316 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6316 uses the same ISO 15 envelope (80×170×39 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6316?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6316VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×170×39 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6316 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6316-RSR",
      "6316-rsr",
      "6316VV",
      "NSK 6316VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6316-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6316ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 135,
    "static_load_kN": 86.5,
    "weight_g": 3670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6316ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 80 mm bore through a 170 mm OD and 39 mm width; the heavier rolling elements also trade away some speed versus a 6216.",
      "ZZ shields are non-contact: 6316-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6316-2RS for that.",
      "Do not wash 6316-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues the shielded version as 6316ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 80 mm bore 6316 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 135 kN dynamic load rating (C) and 86.5 kN static (C0), 6316 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3670 g (3.7 kg), 6316 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 135/86.5 kN load ratings, mass 3670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6316ZZ on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6316-ZZ-NSK bearing?",
        "a": "A 6316-ZZ-NSK deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6316 bore code work?",
        "a": "The last two digits of 6316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the ZZ suffix on 6316-ZZ mean?",
        "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing."
      },
      {
        "q": "What is the NSK suffix for a sealed 6316?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6316ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 80×170×39 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6316ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6316-ZZ",
      "6316-zz",
      "6316ZZ",
      "NSK 6316ZZ",
      "6316-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6316-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6316",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 135,
    "static_load_kN": 86.5,
    "weight_g": 3670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 80 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 80 mm bore the ring mass is significant: heat 6316 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 80 mm bore gains dynamic rating through larger rolling elements on a 170 mm OD; the penalty is mass and a lower limiting speed than the 6216 — do not specify it for speed-critical shafts.",
      "The open 6316-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6316 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 170 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6316-NSK.",
      "The open 6316 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 80 mm bore 6316 is in NSK's upper general-purpose range; the pressed-steel cage is standard, but mid-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "At 135 kN dynamic load rating (C) and 86.5 kN static (C0), 6316 is a heavy-load NSK bearing for industrial gearboxes and large conveyors; NSK expects a machined brass cage (suffix M) at this rating for shock duty, and the static C0 must be checked against any mounting or lifting loads.",
      "At 3670 g (3.7 kg), 6316 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 80×170×39 mm envelope of 6316 gives a D/d ratio of 2.13 and 45.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 135/86.5 kN load ratings, mass 3670 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6316 on the 80×170×39 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6316 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6316-NSK bearing?",
        "a": "A 6316-NSK deep-groove ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6316 mean?",
        "a": "A bare 6316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6300 compare with other series at the same 80 mm bore?",
        "a": "The '3' is the medium diameter series: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 6216 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the NSK order number for an open 6316?",
        "a": "NSK lists the open 6316 under the bare designation 6316; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 80 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6316 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6316-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6316-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "316-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6316",
      "NSK 6316",
      "6316-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6317-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6317DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 97,
    "weight_g": 4280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's contact-seal catalogue number is 6317DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Large bores like the 85 mm of 6317-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.",
      "Heat is the enemy of the sealed 6317-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6317-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 41 mm-wide ring of 6317-2RS-NSK drags the lip and overheats it.",
      "NSK catalogues the contact-sealed version as 6317DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 85 mm bore 6317 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6317 at 146 kN dynamic (C) and 97 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4280 g (4.3 kg), 6317 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 146/97 kN load ratings, mass 4280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6317DDU on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6317 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6317-2RS-NSK bearing?",
        "a": "A 6317-2RS-NSK deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How should 6317-2RS-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 85 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6317-2RS-NSK need?",
        "a": "6317-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6317 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6317?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6317DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×180×41 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6317DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6317-2RS",
      "6317-2rs",
      "6317DDU",
      "NSK 6317DDU",
      "6317-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6317-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6317VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 97,
    "weight_g": 4280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6317-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 85 mm bore; the 180 mm outside diameter and 41 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 85 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6317VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 85 mm of 6317-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium section at 85 mm bore gains dynamic rating through larger rolling elements on a 180 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.",
      "RSR low-friction seals on 6317-RSR run faster than contact-seal 6317-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6317-2RS instead.",
      "The low-drag lip of 6317-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6317-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "NSK catalogues this low-friction non-contact seal as 6317VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 85 mm bore 6317 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6317 at 146 kN dynamic (C) and 97 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4280 g (4.3 kg), 6317 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 146/97 kN load ratings, mass 4280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6317VV on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6317; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6317-RSR bearing?",
        "a": "A 6317-RSR deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What lubrication does 6317-RSR need?",
        "a": "6317-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6317 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6317 bore code work?",
        "a": "The last two digits of 6317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6317?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6317VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×180×41 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6317 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6317-RSR",
      "6317-rsr",
      "6317VV",
      "NSK 6317VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6317-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6317ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 97,
    "weight_g": 4280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6317ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 85 mm bore through a 180 mm OD and 41 mm width; the heavier rolling elements also trade away some speed versus a 6217.",
      "ZZ shields are non-contact: 6317-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6317-2RS for that.",
      "Do not wash 6317-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Vibration during standstill brinells the raceways of a 85 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317-ZZ-NSK.",
      "NSK catalogues the shielded version as 6317ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 85 mm bore 6317 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6317 at 146 kN dynamic (C) and 97 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4280 g (4.3 kg), 6317 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 146/97 kN load ratings, mass 4280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6317ZZ on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6317 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6317-ZZ-NSK bearing?",
        "a": "A 6317-ZZ-NSK deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6317 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6317-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6317-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6317 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6317?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6317ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 85×180×41 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6317 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6317-ZZ",
      "6317-zz",
      "6317ZZ",
      "NSK 6317ZZ",
      "6317-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6317-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6317",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 146,
    "static_load_kN": 97,
    "weight_g": 4280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium section at 85 mm bore gains dynamic rating through larger rolling elements on a 180 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.",
      "The open 6317-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6317-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Measure the shaft, do not trust the drawing: a 85 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6317-NSK.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 41 mm-wide ring of 6317-NSK drags the lip and overheats it.",
      "The open 6317 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 85 mm bore 6317 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6317 at 146 kN dynamic (C) and 97 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4280 g (4.3 kg), 6317 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 85×180×41 mm envelope of 6317 gives a D/d ratio of 2.12 and 47.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 146/97 kN load ratings, mass 4280 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6317 on the 85×180×41 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6317 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6317 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6317-NSK bearing?",
        "a": "A 6317-NSK deep-groove ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 85 mm bore?",
        "a": "The '3' is the medium diameter series: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 6217 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6317 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6317 uses the same ISO 15 envelope (85×180×41 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6317?",
        "a": "NSK lists the open 6317 under the bare designation 6317; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 85 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6317 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6317-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6317-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "317-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6317",
      "NSK 6317",
      "6317-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6318-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6318DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 157,
    "static_load_kN": 107,
    "weight_g": 4980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6318-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6318DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6318-2RS-NSK runs slower and cooler-limited than the open 6318; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6318-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the contact-sealed version as 6318DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 90 mm bore 6318 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6318 at 157 kN dynamic (C) and 107 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4980 g (5.0 kg), 6318 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 157/107 kN load ratings, mass 4980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6318DDU on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6318 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6318-2RS-NSK bearing?",
        "a": "A 6318-2RS-NSK deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6300 compare with other series at the same 90 mm bore?",
        "a": "The '3' is the medium diameter series: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 6218 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6318 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6318 uses the same ISO 15 envelope (90×190×43 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6318?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6318DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×190×43 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6318 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6318-2RS",
      "6318-2rs",
      "6318DDU",
      "NSK 6318DDU",
      "6318-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6318-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6318VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 157,
    "static_load_kN": 107,
    "weight_g": 4980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6318-RSR uses two non-contact elastomer lips with very low drag; coarse debris stays out, but the bearing is not liquid-tight. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's non-contact seal suffix is VV (catalogue number 6318VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "Large bores like the 90 mm of 6318-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.",
      "The low-drag lip of 6318-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "The non-contact lip of 6318-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 90 mm bore position before relying on it as sealed-for-life.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6318-RSR.",
      "Never mix components between two 6318-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues this low-friction non-contact seal as 6318VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 90 mm bore 6318 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6318 at 157 kN dynamic (C) and 107 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4980 g (5.0 kg), 6318 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 157/107 kN load ratings, mass 4980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6318VV on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6318; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6318-RSR bearing?",
        "a": "A 6318-RSR deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "Are 6318 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6318 uses the same ISO 15 envelope (90×190×43 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6318-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6318-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6318?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6318VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×190×43 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6318 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6318-RSR",
      "6318-rsr",
      "6318VV",
      "NSK 6318VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6318-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6318ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 157,
    "static_load_kN": 107,
    "weight_g": 4980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 90 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6318ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 90 mm bore gains dynamic rating through larger rolling elements on a 190 mm OD; the penalty is mass and a lower limiting speed than the 6218 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6318-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6318-2RS for that.",
      "Shielded 6318-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6318-ZZ-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the shielded version as 6318ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 90 mm bore 6318 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6318 at 157 kN dynamic (C) and 107 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4980 g (5.0 kg), 6318 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 157/107 kN load ratings, mass 4980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6318ZZ on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6318 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6318-ZZ-NSK bearing?",
        "a": "A 6318-ZZ-NSK deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6318-ZZ-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 90 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6318-ZZ-NSK need?",
        "a": "6318-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6318?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6318ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 90×190×43 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6318 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6318-ZZ",
      "6318-zz",
      "6318ZZ",
      "NSK 6318ZZ",
      "6318-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6318-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6318",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 157,
    "static_load_kN": 107,
    "weight_g": 4980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6318 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 18 by five gives the 90 mm bore; the 190 mm outside diameter and 43 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 90 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 90 mm bore the ring mass is significant: heat 6318 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 90 mm bore through a 190 mm OD and 43 mm width; the heavier rolling elements also trade away some speed versus a 6218.",
      "Storage matters for open bearings: 6318-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6318 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 190 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6318-NSK.",
      "Measure the shaft, do not trust the drawing: a 90 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6318-NSK.",
      "The open 6318 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 90 mm bore 6318 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6318 at 157 kN dynamic (C) and 107 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 4980 g (5.0 kg), 6318 needs mechanical handling for mounting; NSK recommends induction heating the inner ring (max 120 °C) rather than pressing cold, and a lifting eye if the housing is pre-assembled.",
      "The 90×190×43 mm envelope of 6318 gives a D/d ratio of 2.11 and 50.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 157/107 kN load ratings, mass 4980 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6318 on the 90×190×43 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6318 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6318 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6318-NSK bearing?",
        "a": "A 6318-NSK deep-groove ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6318 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6318 uses the same ISO 15 envelope (90×190×43 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6318-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6318-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6318 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6318?",
        "a": "NSK lists the open 6318 under the bare designation 6318; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 90 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6318 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6318-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6318-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "318-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6318",
      "NSK 6318",
      "6318-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6319-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6319DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 168,
    "static_load_kN": 119,
    "weight_g": 5760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6319-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6319DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "At 95 mm bore the ring mass is significant: heat 6319 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 95 mm bore gains dynamic rating through larger rolling elements on a 200 mm OD; the penalty is mass and a lower limiting speed than the 6219 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6319-2RS-NSK runs slower and cooler-limited than the open 6319; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Heat is the enemy of the sealed 6319-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Vibration during standstill brinells the raceways of a 95 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-2RS-NSK-C3. No clearance suffix means normal CN clearance.",
      "NSK catalogues the contact-sealed version as 6319DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 95 mm bore 6319 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6319 at 168 kN dynamic (C) and 119 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5760 g (5.8 kg), 6319 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 168/119 kN load ratings, mass 5760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6319DDU on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6319 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6319-2RS-NSK bearing?",
        "a": "A 6319-2RS-NSK deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "How does the 6300 compare with other series at the same 95 mm bore?",
        "a": "The '3' is the medium diameter series: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 6219 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6319 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6319 uses the same ISO 15 envelope (95×200×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6319?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6319DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×200×45 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6319 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6319-2RS",
      "6319-2rs",
      "6319DDU",
      "NSK 6319DDU",
      "6319-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6319-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6319VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 168,
    "static_load_kN": 119,
    "weight_g": 5760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6319VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.",
      "RSR low-friction seals on 6319-RSR run faster than contact-seal 6319-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6319-2RS instead.",
      "The low-drag lip of 6319-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.",
      "Measure the shaft, do not trust the drawing: a 95 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6319-RSR.",
      "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues this low-friction non-contact seal as 6319VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 95 mm bore 6319 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6319 at 168 kN dynamic (C) and 119 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5760 g (5.8 kg), 6319 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 168/119 kN load ratings, mass 5760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6319VV on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6319; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6319-RSR bearing?",
        "a": "A 6319-RSR deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "How should 6319-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 95 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6319-RSR need?",
        "a": "6319-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6319 with a housing grease fitting instead."
      },
      {
        "q": "What is the NSK suffix for a sealed 6319?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6319VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×200×45 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6319VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6319-RSR",
      "6319-rsr",
      "6319VV",
      "NSK 6319VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6319-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6319ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 168,
    "static_load_kN": 119,
    "weight_g": 5760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6319-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 19 by five gives the 95 mm bore; the 200 mm outside diameter and 45 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 95 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6319ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At 95 mm bore the ring mass is significant: heat 6319 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.",
      "Do not wash 6319-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6319-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Never mix components between two 6319-ZZ-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The housing bore for the 200 mm OD should be round within IT7; an oval bore pinches the outer ring of 6319-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "NSK catalogues the shielded version as 6319ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 95 mm bore 6319 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6319 at 168 kN dynamic (C) and 119 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5760 g (5.8 kg), 6319 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 168/119 kN load ratings, mass 5760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6319ZZ on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6319-ZZ-NSK bearing?",
        "a": "A 6319-ZZ-NSK deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6319 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6319 uses the same ISO 15 envelope (95×200×45 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6319-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6319-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6319 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6319?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6319ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 95×200×45 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6319ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6319-ZZ",
      "6319-zz",
      "6319ZZ",
      "NSK 6319ZZ",
      "6319-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6319-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6319",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 168,
    "static_load_kN": 119,
    "weight_g": 5760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 95 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 95 mm of 6319-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 95 mm bore through a 200 mm OD and 45 mm width; the heavier rolling elements also trade away some speed versus a 6219.",
      "The open 6319-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6319 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 200 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6319-NSK.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6319-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6319 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 95 mm bore 6319 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6319 at 168 kN dynamic (C) and 119 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 5760 g (5.8 kg), 6319 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 95×200×45 mm envelope of 6319 gives a D/d ratio of 2.11 and 52.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 168/119 kN load ratings, mass 5760 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6319 on the 95×200×45 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6319 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6319 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6319-NSK bearing?",
        "a": "A 6319-NSK deep-groove ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6319-NSK need?",
        "a": "The open 6319-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6319 bore code work?",
        "a": "The last two digits of 6319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6319?",
        "a": "NSK lists the open 6319 under the bare designation 6319; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 95 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6319?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6319-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6319-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 95×200×45 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6319",
      "NSK 6319",
      "6319-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6320-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6320DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 191,
    "static_load_kN": 141,
    "weight_g": 7040,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6320-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 20 by five gives the 100 mm bore; the 215 mm outside diameter and 47 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 100 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6320DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Large bores like the 100 mm of 6320-2RS-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.",
      "Heat is the enemy of the sealed 6320-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.",
      "Never wash a sealed 6320-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Vibration during standstill brinells the raceways of a 100 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "NSK catalogues the contact-sealed version as 6320DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 100 mm bore 6320 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6320 at 191 kN dynamic (C) and 141 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7040 g (7.0 kg), 6320 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 191/141 kN load ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320DDU on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6320-2RS-NSK bearing?",
        "a": "A 6320-2RS-NSK deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What lubrication does 6320-2RS-NSK need?",
        "a": "6320-2RS-NSK is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6320 with a housing grease fitting instead."
      },
      {
        "q": "How does the 6320 bore code work?",
        "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6320?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6320DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×215×47 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6320DDU keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6320-2RS",
      "6320-2rs",
      "6320DDU",
      "NSK 6320DDU",
      "6320-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6320-RSR",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6320VV",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "RSR",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 191,
    "static_load_kN": 141,
    "weight_g": 7040,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK's non-contact seal suffix is VV (catalogue number 6320VV), mapped here from the industry-neutral -RSR spelling; speed capability is close to the open bearing but VV is not liquid-tight.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)",
      "lip-lubricant starvation if the bearing runs dry for extended periods",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Large bores like the 100 mm of 6320-RSR demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.",
      "RSR low-friction seals on 6320-RSR run faster than contact-seal 6320-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 6320-2RS instead.",
      "The non-contact lip of 6320-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 100 mm bore position before relying on it as sealed-for-life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6320-C3. No clearance suffix means normal CN clearance.",
      "The housing bore for the 215 mm OD should be round within IT7; an oval bore pinches the outer ring of 6320-RSR and shows up later as two-point loaded raceway wear.",
      "NSK catalogues this low-friction non-contact seal as 6320VV (suffix VV), mapped here from the industry-neutral -RSR spelling. NSK rates its speed capability close to the open bearing, but VV is not liquid-tight — for wet or fine-dust duty step up to the DDU contact seal (industry-neutral -2RS).",
      "At 100 mm bore 6320 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6320 at 191 kN dynamic (C) and 141 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7040 g (7.0 kg), 6320 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 191/141 kN load ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320VV on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6320 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6320-RSR bearing?",
        "a": "A 6320-RSR deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals."
      },
      {
        "q": "What internal clearance does 6320-RSR have?",
        "a": "Unless a clearance suffix says otherwise, 6320-RSR is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6320 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6320-RSR be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 100 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6320?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6320VV), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×215×47 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6320VV keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6320-RSR",
      "6320-rsr",
      "6320VV",
      "NSK 6320VV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6320-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6320ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 191,
    "static_load_kN": 141,
    "weight_g": 7040,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6320ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.",
      "ZZ shields are non-contact: 6320-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6320-2RS for that.",
      "Shielded 6320-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 215 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6320-ZZ-NSK.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "NSK catalogues the shielded version as 6320ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 100 mm bore 6320 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6320 at 191 kN dynamic (C) and 141 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7040 g (7.0 kg), 6320 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 191/141 kN load ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320ZZ on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6320; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6320-ZZ-NSK bearing?",
        "a": "A 6320-ZZ-NSK deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6320-ZZ-NSK need?",
        "a": "6320-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6320 bore code work?",
        "a": "The last two digits of 6320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6320?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6320ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 100×215×47 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6320ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6320-ZZ",
      "6320-zz",
      "6320ZZ",
      "NSK 6320ZZ",
      "6320-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6320",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6320",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 191,
    "static_load_kN": 141,
    "weight_g": 7040,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 100 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 100 mm bore the ring mass is significant: heat 6320 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 100 mm bore through a 215 mm OD and 47 mm width; the heavier rolling elements also trade away some speed versus a 6220.",
      "The open 6320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6320 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Never mix components between two 6320 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6320 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 100 mm bore 6320 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6320 at 191 kN dynamic (C) and 141 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 7040 g (7.0 kg), 6320 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 100×215×47 mm envelope of 6320 gives a D/d ratio of 2.15 and 57.5 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 191/141 kN load ratings, mass 7040 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6320 on the 100×215×47 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6320 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6320 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6320 bearing?",
        "a": "A 6320 deep-groove ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 100 mm bore?",
        "a": "The '3' is the medium diameter series: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 6220 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6320 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6320 uses the same ISO 15 envelope (100×215×47 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6320?",
        "a": "NSK lists the open 6320 under the bare designation 6320; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 100 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6320 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6320-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-RSR-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6320-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 100×215×47 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6320",
      "NSK 6320"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6321-2RS",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6321DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 202,
    "static_load_kN": 154,
    "weight_g": 8090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6321-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6321DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At 105 mm bore the ring mass is significant: heat 6321 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6321-2RS runs slower and cooler-limited than the open 6321; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6321-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6321-C3. No clearance suffix means normal CN clearance.",
      "Never mix components between two 6321-2RS units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the contact-sealed version as 6321DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 105 mm bore 6321 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6321 at 202 kN dynamic (C) and 154 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8090 g (8.1 kg), 6321 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 202/154 kN load ratings, mass 8090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6321DDU on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6321; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6321-2RS bearing?",
        "a": "A 6321-2RS deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What internal clearance does 6321-2RS have?",
        "a": "Unless a clearance suffix says otherwise, 6321-2RS is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6321 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6321-2RS be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6321?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6321DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×225×49 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6321 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6321-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6321-2RS",
      "6321-2rs",
      "6321DDU",
      "NSK 6321DDU"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6321-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6321ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 202,
    "static_load_kN": 154,
    "weight_g": 8090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6321-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 21 by five gives the 105 mm bore; the 225 mm outside diameter and 49 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 105 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6321ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium section at 105 mm bore gains dynamic rating through larger rolling elements on a 225 mm OD; the penalty is mass and a lower limiting speed than the 6221 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6321-ZZ-NSK blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6321-2RS for that.",
      "Do not wash 6321-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Shaft and housing fillets must clear the bearing chamfer so the 49 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the shielded version as 6321ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 105 mm bore 6321 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6321 at 202 kN dynamic (C) and 154 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8090 g (8.1 kg), 6321 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 202/154 kN load ratings, mass 8090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6321ZZ on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6321; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6321-ZZ-NSK bearing?",
        "a": "A 6321-ZZ-NSK deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "Are 6321 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6321 uses the same ISO 15 envelope (105×225×49 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What internal clearance does 6321-ZZ-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6321-ZZ-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6321 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK suffix for a sealed 6321?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6321ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 105×225×49 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6321 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6321-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6321-ZZ",
      "6321-zz",
      "6321ZZ",
      "NSK 6321ZZ",
      "6321-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6321-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6321",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 202,
    "static_load_kN": 154,
    "weight_g": 8090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 105 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 105 mm bore through a 225 mm OD and 49 mm width; the heavier rolling elements also trade away some speed versus a 6221.",
      "Storage matters for open bearings: 6321-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6321 units.",
      "The housing bore for the 225 mm OD should be round within IT7; an oval bore pinches the outer ring of 6321-NSK and shows up later as two-point loaded raceway wear.",
      "Measure the shaft, do not trust the drawing: a 105 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6321-NSK.",
      "The open 6321 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 105 mm bore 6321 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6321 at 202 kN dynamic (C) and 154 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 8090 g (8.1 kg), 6321 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 105×225×49 mm envelope of 6321 gives a D/d ratio of 2.14 and 60.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 202/154 kN load ratings, mass 8090 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6321 on the 105×225×49 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6321 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6321; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6321-NSK bearing?",
        "a": "A 6321-NSK deep-groove ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width (4.134 × 8.858 × 1.929 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What internal clearance does 6321-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6321-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6321 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6321-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 105 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK order number for an open 6321?",
        "a": "NSK lists the open 6321 under the bare designation 6321; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 105 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6321 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6321-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6321-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6321",
      "NSK 6321",
      "6321-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6322-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6322ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 226,
    "static_load_kN": 179,
    "weight_g": 9510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 110 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6322ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.",
      "Do not wash 6322-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6322-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Never mix components between two 6322-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6322ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 110 mm bore 6322 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6322 at 226 kN dynamic (C) and 179 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 9510 g (9.5 kg), 6322 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 226/179 kN load ratings, mass 9510 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6322ZZ on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6322 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6322-ZZ bearing?",
        "a": "A 6322-ZZ deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6322-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 110 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6322-ZZ need?",
        "a": "6322-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6322?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6322ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 110×240×50 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6322ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-RSR",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6322-ZZ",
      "6322-zz",
      "6322ZZ",
      "NSK 6322ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6322-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6322",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 226,
    "static_load_kN": 179,
    "weight_g": 9510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6322 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 22 by five gives the 110 mm bore; the 240 mm outside diameter and 50 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 110 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At 110 mm bore the ring mass is significant: heat 6322 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 110 mm bore gains dynamic rating through larger rolling elements on a 240 mm OD; the penalty is mass and a lower limiting speed than the 6222 — do not specify it for speed-critical shafts.",
      "Storage matters for open bearings: 6322-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6322 units.",
      "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 240 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6322-NSK.",
      "The open 6322 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 110 mm bore 6322 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6322 at 226 kN dynamic (C) and 179 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 9510 g (9.5 kg), 6322 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 110×240×50 mm envelope of 6322 gives a D/d ratio of 2.18 and 65.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 226/179 kN load ratings, mass 9510 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6322 on the 110×240×50 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6322 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6322-NSK bearing?",
        "a": "A 6322-NSK deep-groove ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6322-NSK need?",
        "a": "The open 6322-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6322 bore code work?",
        "a": "The last two digits of 6322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6322?",
        "a": "NSK lists the open 6322 under the bare designation 6322; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 110 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6322 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6322-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-2RS",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-RSR",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6322-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6322",
      "NSK 6322",
      "6322-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6324-2RS-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6324DDU",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 227,
    "static_load_kN": 185,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6324-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK's contact-seal catalogue number is 6324DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "seal-lip hardening and loss of pre-grease in sustained high-temperature service",
      "grease-life expiry in the sealed-for-life cavity (no relubrication path)",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 120 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium section at 120 mm bore gains dynamic rating through larger rolling elements on a 260 mm OD; the penalty is mass and a lower limiting speed than the 6224 — do not specify it for speed-critical shafts.",
      "Contact seals add drag and heat: 6324-2RS-NSK runs slower and cooler-limited than the open 6324; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.",
      "Never wash a sealed 6324-2RS-NSK in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.",
      "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.",
      "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "NSK catalogues the contact-sealed version as 6324DDU (suffix DDU), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. NSK's DDU lip design is single-lip contact, so grease life is longer than VV but drag torque is higher.",
      "At 120 mm bore 6324 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6324 at 227 kN dynamic (C) and 185 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12500 g (12.5 kg), 6324 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 227/185 kN load ratings, mass 12500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6324DDU on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6324 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6324-2RS-NSK bearing?",
        "a": "A 6324-2RS-NSK deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased."
      },
      {
        "q": "What does the 2RS suffix on 6324-2RS mean?",
        "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling."
      },
      {
        "q": "How does the 6300 compare with other series at the same 120 mm bore?",
        "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the NSK suffix for a sealed 6324?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6324DDU), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×260×55 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6324DDU?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6324-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-2RS",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6324-2RS",
      "6324-2rs",
      "6324DDU",
      "NSK 6324DDU",
      "6324-2RS-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6324-ZZ-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6324ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 227,
    "static_load_kN": 185,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6324 carries bore code 24 = 120 mm. Outside diameter 260 mm and width 55 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6324ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "electrical pitting in VFD-driven motors without grounding protection",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Large bores like the 120 mm of 6324-ZZ-NSK demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 120 mm bore through a 260 mm OD and 55 mm width; the heavier rolling elements also trade away some speed versus a 6224.",
      "Do not wash 6324-ZZ-NSK in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6324-ZZ-NSK units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "The housing bore for the 260 mm OD should be round within IT7; an oval bore pinches the outer ring of 6324-ZZ-NSK and shows up later as two-point loaded raceway wear.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 260 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6324-ZZ-NSK.",
      "NSK catalogues the shielded version as 6324ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "At 120 mm bore 6324 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6324 at 227 kN dynamic (C) and 185 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12500 g (12.5 kg), 6324 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 227/185 kN load ratings, mass 12500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6324ZZ on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6324-ZZ-NSK bearing?",
        "a": "A 6324-ZZ-NSK deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What lubrication does 6324-ZZ-NSK need?",
        "a": "6324-ZZ-NSK is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "How does the 6324 bore code work?",
        "a": "The last two digits of 6324 are bore code 24, giving 24 × 5 = 120 mm bore. The 260 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK suffix for a sealed 6324?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6324ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 120×260×55 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6324ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6324-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-ZZ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6324-ZZ",
      "6324-zz",
      "6324ZZ",
      "NSK 6324ZZ",
      "6324-ZZ-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6324-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6324",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 227,
    "static_load_kN": 185,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6324 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 260 mm outside diameter and 55 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 120 mm bore the ring mass is significant: heat 6324 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 120 mm bore gains dynamic rating through larger rolling elements on a 260 mm OD; the penalty is mass and a lower limiting speed than the 6224 — do not specify it for speed-critical shafts.",
      "The open 6324-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 120×260×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6324 units.",
      "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.",
      "Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6324-NSK.",
      "The open 6324 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "At 120 mm bore 6324 is in NSK's medium industrial range; the pressed-steel cage is standard, but large-section 63xx sizes at this bore can be ordered with a machined brass cage (suffix M) for heavy-shock or very-low-speed duty — confirm cage material with the NSK channel if the application sees impact loads.",
      "NSK rates 6324 at 227 kN dynamic (C) and 185 kN static (C0); this heavy-load rating is at the upper end of the E1103 Part C single-row deep-groove extract — NSK supplies a machined brass cage (suffix M) and expects an application review, because catalogue L10 life alone does not capture shock and misalignment loads at this rating.",
      "At 12500 g (12.5 kg), 6324 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 120×260×55 mm envelope of 6324 gives a D/d ratio of 2.17 and 70.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 227/185 kN load ratings, mass 12500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6324 on the 120×260×55 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6324 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6324-NSK bearing?",
        "a": "A 6324-NSK deep-groove ball bearing has a 120 mm bore, 260 mm outer diameter and 55 mm width (4.724 × 10.236 × 2.165 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What does no suffix on 6324 mean?",
        "a": "A bare 6324 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 6300 compare with other series at the same 120 mm bore?",
        "a": "The '3' is the medium diameter series: 260×55 mm, 70.0 mm radial section at 120 mm bore, carrying more load than a 6224 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "What is the NSK order number for an open 6324?",
        "a": "NSK lists the open 6324 under the bare designation 6324; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 120 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6324 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6324-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-2RS-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-ZZ-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-ZZ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6324-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 120×260×55 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6324",
      "NSK 6324",
      "6324-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6326-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6326ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 252,
    "static_load_kN": 214,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. NSK catalogue order number: 6326ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass is significant: heat 6326 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium section at 130 mm bore gains dynamic rating through larger rolling elements on a 280 mm OD; the penalty is mass and a lower limiting speed than the 6226 — do not specify it for speed-critical shafts.",
      "ZZ shields are non-contact: 6326-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6326-2RS for that.",
      "Do not wash 6326-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "The housing bore for the 280 mm OD should be round within IT7; an oval bore pinches the outer ring of 6326-ZZ and shows up later as two-point loaded raceway wear.",
      "Never mix components between two 6326-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6326ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 130 mm bore places 6326 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6326 at 252 kN dynamic (C) and 214 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 15200 g (15.2 kg), 6326 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×280×58 mm envelope of 6326 gives a D/d ratio of 2.15 and 75.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 252/214 kN load ratings, mass 15200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6326ZZ on the 130×280×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6326 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6326; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6326 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6326-ZZ bearing?",
        "a": "A 6326-ZZ deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6326-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 6326-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6326 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6326-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 130 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6326?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6326ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 130×280×58 mm ISO 15 envelope."
      },
      {
        "q": "Does NSK offer 6326 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6326-FAG",
        "equiv_brand": "FAG",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6326-ZZ",
      "6326-zz",
      "6326ZZ",
      "NSK 6326ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6326-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6326",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 252,
    "static_load_kN": 214,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6326 carries bore code 26 = 130 mm. Outside diameter 280 mm and width 58 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 130 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "At 130 mm bore the ring mass is significant: heat 6326 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 130 mm bore through a 280 mm OD and 58 mm width; the heavier rolling elements also trade away some speed versus a 6226.",
      "The open 6326-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 130×280×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6326 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 280 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6326-NSK.",
      "A 130 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "The open 6326 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 130 mm bore places 6326 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6326 at 252 kN dynamic (C) and 214 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 15200 g (15.2 kg), 6326 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 130×280×58 mm envelope of 6326 gives a D/d ratio of 2.15 and 75.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 252/214 kN load ratings, mass 15200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6326 on the 130×280×58 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6326 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6326; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6326-NSK bearing?",
        "a": "A 6326-NSK deep-groove ball bearing has a 130 mm bore, 280 mm outer diameter and 58 mm width (5.118 × 11.024 × 2.283 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6326 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6326 uses the same ISO 15 envelope (130×280×58 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6326-NSK have?",
        "a": "Unless a clearance suffix says otherwise, 6326-NSK is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6326 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6326?",
        "a": "NSK lists the open 6326 under the bare designation 6326; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 130 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6326 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6326-FAG",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6326-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6326",
      "NSK 6326",
      "6326-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6328-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6328ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 278,
    "static_load_kN": 246,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6328-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 300 mm outside diameter and 62 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6328ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "Large bores like the 140 mm of 6328-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium section at 140 mm bore gains dynamic rating through larger rolling elements on a 300 mm OD; the penalty is mass and a lower limiting speed than the 6228 — do not specify it for speed-critical shafts.",
      "Do not wash 6328-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6328-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6328-ZZ.",
      "Never mix components between two 6328-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "NSK catalogues the shielded version as 6328ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 140 mm bore places 6328 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6328 at 278 kN dynamic (C) and 246 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 18500 g (18.5 kg), 6328 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 140×300×62 mm envelope of 6328 gives a D/d ratio of 2.14 and 80.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 278/246 kN load ratings, mass 18500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6328ZZ on the 140×300×62 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6328 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6328-ZZ bearing?",
        "a": "A 6328-ZZ deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 140 mm bore?",
        "a": "The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6328 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6328 uses the same ISO 15 envelope (140×300×62 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)."
      },
      {
        "q": "What is the NSK suffix for a sealed 6328?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6328ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 140×300×62 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6328ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6328-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6328",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6328-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6328-ZZ",
      "6328-zz",
      "6328ZZ",
      "NSK 6328ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6328-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6328",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 278,
    "static_load_kN": 246,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6328 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 28 by five gives the 140 mm bore; the 300 mm outside diameter and 62 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 140 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "brinelling from static overload or hammering during mounting"
    ],
    "pitfalls": [
      "At 140 mm bore the ring mass is significant: heat 6328 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 140 mm bore through a 300 mm OD and 62 mm width; the heavier rolling elements also trade away some speed versus a 6228.",
      "Storage matters for open bearings: 6328-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6328 units.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 300 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6328-NSK.",
      "Shaft and housing fillets must clear the bearing chamfer so the 62 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.",
      "The open 6328 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 140 mm bore places 6328 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6328 at 278 kN dynamic (C) and 246 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 18500 g (18.5 kg), 6328 is a heavy NSK bearing that requires a crane or hoist for handling; induction-heat the inner ring (max 120 °C) and use a mechanical puller for removal — never apply heat directly to the balls or cage.",
      "The 140×300×62 mm envelope of 6328 gives a D/d ratio of 2.14 and 80.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 278/246 kN load ratings, mass 18500 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6328 on the 140×300×62 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6328 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6328-NSK bearing?",
        "a": "A 6328-NSK deep-groove ball bearing has a 140 mm bore, 300 mm outer diameter and 62 mm width (5.512 × 11.811 × 2.441 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 140 mm bore?",
        "a": "The '3' is the medium diameter series: 300×62 mm, 80.0 mm radial section at 140 mm bore, carrying more load than a 6228 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6328 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6328 uses the same ISO 15 envelope (140×300×62 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6328?",
        "a": "NSK lists the open 6328 under the bare designation 6328; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 140 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6328 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6328-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6328",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6328-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6328",
      "NSK 6328",
      "6328-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6330-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6330ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 300,
    "static_load_kN": 284,
    "weight_g": 22700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6330-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 320 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6330ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "raceway smearing under marginal lubrication at start-up",
      "edge loading from shaft deflection or housing misalignment"
    ],
    "pitfalls": [
      "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 150 mm bore through a 320 mm OD and 65 mm width; the heavier rolling elements also trade away some speed versus a 6230.",
      "Do not wash 6330-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6330-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Measure the shaft, do not trust the drawing: a 150 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6330-ZZ.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 320 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6330-ZZ.",
      "NSK catalogues the shielded version as 6330ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 150 mm bore places 6330 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6330 at 300 kN dynamic (C) and 284 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 22700 g (22.7 kg), 6330 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 150×320×65 mm envelope of 6330 gives a D/d ratio of 2.13 and 85.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 300/284 kN load ratings, mass 22700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6330ZZ on the 150×320×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6330 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6330-ZZ bearing?",
        "a": "A 6330-ZZ deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "What internal clearance does 6330-ZZ have?",
        "a": "Unless a clearance suffix says otherwise, 6330-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6330 and verify the residual clearance after mounting."
      },
      {
        "q": "How should 6330-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 150 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What is the NSK suffix for a sealed 6330?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6330ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 150×320×65 mm ISO 15 envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6330ZZ?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6330-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6330",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6330-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6330-ZZ",
      "6330-zz",
      "6330ZZ",
      "NSK 6330ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6330-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6330",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 300,
    "static_load_kN": 284,
    "weight_g": 22700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6330 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 320 mm outside diameter and 65 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 150 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium section at 150 mm bore gains dynamic rating through larger rolling elements on a 320 mm OD; the penalty is mass and a lower limiting speed than the 6230 — do not specify it for speed-critical shafts.",
      "The open 6330-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 150×320×65 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6330-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "A 150 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6330 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 150 mm bore places 6330 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6330 at 300 kN dynamic (C) and 284 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 22700 g (22.7 kg), 6330 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 150×320×65 mm envelope of 6330 gives a D/d ratio of 2.13 and 85.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 300/284 kN load ratings, mass 22700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6330 on the 150×320×65 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6330 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6330; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6330-NSK bearing?",
        "a": "A 6330-NSK deep-groove ball bearing has a 150 mm bore, 320 mm outer diameter and 65 mm width (5.906 × 12.598 × 2.559 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6330-NSK need?",
        "a": "The open 6330-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6330 bore code work?",
        "a": "The last two digits of 6330 are bore code 30, giving 30 × 5 = 150 mm bore. The 320 mm outside diameter and 65 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6330?",
        "a": "NSK lists the open 6330 under the bare designation 6330; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 150 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6330 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6330-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6330",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6330-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 150×320×65 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6330",
      "NSK 6330",
      "6330-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6332-ZZ",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6332ZZ",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "ZZ",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 305,
    "static_load_kN": 287,
    "weight_g": 26200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6332-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 340 mm outside diameter and 68 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. NSK catalogue order number: 6332ZZ (suffix ZZ), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "fine-particle abrasion when non-contact shields let dust past in dirty duty",
      "grease aging in the shield-for-life cavity with no relubrication path",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore the ring mass is significant: heat 6332 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 160 mm bore through a 340 mm OD and 68 mm width; the heavier rolling elements also trade away some speed versus a 6232.",
      "Do not wash 6332-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.",
      "Shielded 6332-ZZ units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 340 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6332-ZZ.",
      "Measure the shaft, do not trust the drawing: a 160 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6332-ZZ.",
      "NSK catalogues the shielded version as 6332ZZ — suffix ZZ, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the NSK order number when buying through an NSK channel.",
      "The 160 mm bore places 6332 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6332 at 305 kN dynamic (C) and 287 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 26200 g (26.2 kg), 6332 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 160×340×68 mm envelope of 6332 gives a D/d ratio of 2.13 and 90.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 305/287 kN load ratings, mass 26200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6332ZZ on the 160×340×68 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6332 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6332; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6332-ZZ bearing?",
        "a": "A 6332-ZZ deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields."
      },
      {
        "q": "How should 6332-ZZ be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6332-ZZ need?",
        "a": "6332-ZZ is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it."
      },
      {
        "q": "What is the NSK suffix for a sealed 6332?",
        "a": "NSK uses suffix DDU for the contact rubber seal (catalogue number 6332ZZ), VV for the non-contact rubber seal, and ZZ for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those NSK suffixes while keeping the 160×340×68 mm ISO 15 envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6332ZZ keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6332-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6332-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6332-ZZ",
      "6332-zz",
      "6332ZZ",
      "NSK 6332ZZ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6332",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6332",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 305,
    "static_load_kN": 287,
    "weight_g": 26200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6332 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 32 by five gives the 160 mm bore; the 340 mm outside diameter and 68 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 160 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 160 mm of 6332 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium section at 160 mm bore gains dynamic rating through larger rolling elements on a 340 mm OD; the penalty is mass and a lower limiting speed than the 6232 — do not specify it for speed-critical shafts.",
      "The open 6332 has no lubricant retention: grease escapes and contaminants migrate straight into the 160×340×68 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6332 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6332-C3. No clearance suffix means normal CN clearance.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "The open 6332 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 160 mm bore places 6332 at the lower end of NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6332 at 305 kN dynamic (C) and 287 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 26200 g (26.2 kg), 6332 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 160×340×68 mm envelope of 6332 gives a D/d ratio of 2.13 and 90.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 305/287 kN load ratings, mass 26200 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6332 on the 160×340×68 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6332 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6332 bearing?",
        "a": "A 6332 deep-groove ball bearing has a 160 mm bore, 340 mm outer diameter and 68 mm width (6.299 × 13.386 × 2.677 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6332 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 160 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6332 need?",
        "a": "The open 6332 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6332?",
        "a": "NSK lists the open 6332 under the bare designation 6332; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 160 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6332 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6332-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6332-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6332",
      "NSK 6332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6334-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6334",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 360,
    "static_load_kN": 355,
    "weight_g": 36600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6334 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 34 by five gives the 170 mm bore; the 360 mm outside diameter and 72 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 170 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery",
      "medium and heavy industrial drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Mount this 170 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 170 mm bore through a 360 mm OD and 72 mm width; the heavier rolling elements also trade away some speed versus a 6234.",
      "The open 6334-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 170×360×72 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6334-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "The housing bore for the 360 mm OD should be round within IT7; an oval bore pinches the outer ring of 6334-NSK and shows up later as two-point loaded raceway wear.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6334-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6334 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 170 mm bore places 6334 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6334 at 360 kN dynamic (C) and 355 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 36600 g (36.6 kg), 6334 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 170×360×72 mm envelope of 6334 gives a D/d ratio of 2.12 and 95.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 360/355 kN load ratings, mass 36600 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6334 on the 170×360×72 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6334 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6334; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6334-NSK bearing?",
        "a": "A 6334-NSK deep-groove ball bearing has a 170 mm bore, 360 mm outer diameter and 72 mm width (6.693 × 14.173 × 2.835 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 170 mm bore?",
        "a": "The '3' is the medium diameter series: 360×72 mm, 95.0 mm radial section at 170 mm bore, carrying more load than a 6234 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6334 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6334 uses the same ISO 15 envelope (170×360×72 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6334?",
        "a": "NSK lists the open 6334 under the bare designation 6334; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 170 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6334 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6334-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6334",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6334-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×72 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6334",
      "NSK 6334",
      "6334-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6336-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6336",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 390,
    "static_load_kN": 405,
    "weight_g": 43100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6336 carries bore code 36 = 180 mm. Outside diameter 380 mm and width 75 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 180 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading from shaft deflection or housing misalignment",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 180 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium series gains rating at 180 mm bore through a 380 mm OD and 75 mm width; the heavier rolling elements also trade away some speed versus a 6236.",
      "Storage matters for open bearings: 6336-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6336 units.",
      "Vibration during standstill brinells the raceways of a 180 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.",
      "Never mix components between two 6336-NSK units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "The open 6336 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 180 mm bore places 6336 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6336 at 390 kN dynamic (C) and 405 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 43100 g (43.1 kg), 6336 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 180×380×75 mm envelope of 6336 gives a D/d ratio of 2.11 and 100.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 390/405 kN load ratings, mass 43100 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6336 on the 180×380×75 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6336 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6336-NSK bearing?",
        "a": "A 6336-NSK deep-groove ball bearing has a 180 mm bore, 380 mm outer diameter and 75 mm width (7.087 × 14.961 × 2.953 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6336-NSK be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 180 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6336-NSK need?",
        "a": "The open 6336-NSK is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6336?",
        "a": "NSK lists the open 6336 under the bare designation 6336; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 180 mm bore envelope."
      },
      {
        "q": "Does NSK offer 6336 with C3 clearance?",
        "a": "NSK lists C3 (and C4) internal-clearance options for most deep-groove sizes under the same base designation; the clearance is fixed at manufacture, so specify it at order time rather than planning to adjust later."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6336-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6336",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6336-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6336",
      "NSK 6336",
      "6336-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6338-NSK",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6338",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 390,
    "static_load_kN": 415,
    "weight_g": 49700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6338 carries bore code 38 = 190 mm. Outside diameter 400 mm and width 78 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 190 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "cage damage from operation beyond the limiting speed"
    ],
    "pitfalls": [
      "At 190 mm bore the ring mass is significant: heat 6338 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.",
      "The 63xx medium series gains rating at 190 mm bore through a 400 mm OD and 78 mm width; the heavier rolling elements also trade away some speed versus a 6238.",
      "The open 6338-NSK has no lubricant retention: grease escapes and contaminants migrate straight into the 190×400×78 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6338-NSK leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Do not quieten a noisy bearing by preloading it: the 6300-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6338-NSK-C3. No clearance suffix means normal CN clearance.",
      "The open 6338 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 190 mm bore places 6338 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6338 at 390 kN dynamic (C) and 415 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 49700 g (49.7 kg), 6338 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 190×400×78 mm envelope of 6338 gives a D/d ratio of 2.11 and 105.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 390/415 kN load ratings, mass 49700 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6338 on the 190×400×78 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6338 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "NSK does not recommend washing new shielded or sealed bearings; the rust-preventive film on open units is compatible with standard lithium greases and needs no removal unless the application demands a special fill.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6338 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6338-NSK bearing?",
        "a": "A 6338-NSK deep-groove ball bearing has a 190 mm bore, 400 mm outer diameter and 78 mm width (7.48 × 15.748 × 3.071 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How does the 6300 compare with other series at the same 190 mm bore?",
        "a": "The '3' is the medium diameter series: 400×78 mm, 105.0 mm radial section at 190 mm bore, carrying more load than a 6238 but needing a larger housing bore and giving up some speed."
      },
      {
        "q": "Are 6338 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6338 uses the same ISO 15 envelope (190×400×78 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What is the NSK order number for an open 6338?",
        "a": "NSK lists the open 6338 under the bare designation 6338; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 190 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6338?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6338-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6338",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6338-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 190×400×78 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6338",
      "NSK 6338",
      "6338-NSK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6340",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6340",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 415,
    "static_load_kN": 445,
    "weight_g": 55300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6340 carries bore code 40 = 200 mm. Outside diameter 420 mm and width 80 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 200 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors",
      "pulp and paper machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Large bores like the 200 mm of 6340 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium section at 200 mm bore gains dynamic rating through larger rolling elements on a 420 mm OD; the penalty is mass and a lower limiting speed than the 6240 — do not specify it for speed-critical shafts.",
      "The open 6340 has no lubricant retention: grease escapes and contaminants migrate straight into the 200×420×80 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6340 units.",
      "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6340-C3. No clearance suffix means normal CN clearance.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 420 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6340.",
      "The open 6340 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 200 mm bore places 6340 in NSK's large-size range; at these diameters the pressed-steel cage is speed-limited and NSK commonly supplies a machined brass cage (suffix M) as an option. Verify cage material and relubrication interval with the NSK distributor, and do not extrapolate small-bore speed ratings to this size.",
      "NSK rates 6340 at 415 kN dynamic (C) and 445 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 55300 g (55.3 kg), 6340 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 200×420×80 mm envelope of 6340 gives a D/d ratio of 2.10 and 110.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 415/445 kN load ratings, mass 55300 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6340 on the 200×420×80 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6340 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Keep NSK bearings in the original packaging until fitting: the wrapper carries the production lot, and the unopened shelf life of greased sealed units is typically quoted at three to five years in dry, vibration-free storage.",
      "NSK supplies its sealed units pre-greased for general duty between roughly -10 and +110 °C; low-temperature, food-grade and high-temperature fills are special executions — ask at order time, because DDU/VV units are not designed to be opened and repacked."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6340 bearing?",
        "a": "A 6340 deep-groove ball bearing has a 200 mm bore, 420 mm outer diameter and 80 mm width (7.874 × 16.535 × 3.15 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "How should 6340 be mounted?",
        "a": "Apply the mounting force to the ring being fitted: on a 200 mm shaft seat the press load must pass through the inner-ring face only. Induction heating of the inner ring (max 120 °C) is the clean method at this size. Never strike the outer ring, the cage or the seals."
      },
      {
        "q": "What lubrication does 6340 need?",
        "a": "The open 6340 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "What is the NSK order number for an open 6340?",
        "a": "NSK lists the open 6340 under the bare designation 6340; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 200 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6340 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6340-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×420×80 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6340",
      "NSK 6340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6344",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6344",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 450,
    "static_load_kN": 520,
    "weight_g": 73900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6344 carries bore code 44 = 220 mm. Outside diameter 460 mm and width 88 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 220 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "large gearboxes",
      "industrial fans and blowers",
      "hoists and winches",
      "heavy conveyors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "brinelling from static overload or hammering during mounting",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 220 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 63xx medium section at 220 mm bore gains dynamic rating through larger rolling elements on a 460 mm OD; the penalty is mass and a lower limiting speed than the 6244 — do not specify it for speed-critical shafts.",
      "The open 6344 has no lubricant retention: grease escapes and contaminants migrate straight into the 220×460×88 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6344 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 88 mm-wide ring of 6344 drags the lip and overheats it.",
      "Deep-groove ball bearings tolerate only minutes of misalignment; if the 460 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6344.",
      "The open 6344 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 220 mm bore places 6344 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6344 at 450 kN dynamic (C) and 520 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 73900 g (73.9 kg), 6344 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 220×460×88 mm envelope of 6344 gives a D/d ratio of 2.09 and 120.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 450/520 kN load ratings, mass 73900 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6344 on the 220×460×88 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6344 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6344 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life.",
      "NSK's VV non-contact seal keeps frictional torque close to the open 6344; in motor duty where heat build-up matters, VV is the usual compromise between debris protection and speed capability."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6344 bearing?",
        "a": "A 6344 deep-groove ball bearing has a 220 mm bore, 460 mm outer diameter and 88 mm width (8.661 × 18.11 × 3.465 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "Are 6344 bearings from different brands interchangeable?",
        "a": "For boundary dimensions, yes: every brand's 6344 uses the same ISO 15 envelope (220×460×88 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting."
      },
      {
        "q": "What internal clearance does 6344 have?",
        "a": "Unless a clearance suffix says otherwise, 6344 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6344 and verify the residual clearance after mounting."
      },
      {
        "q": "What is the NSK order number for an open 6344?",
        "a": "NSK lists the open 6344 under the bare designation 6344; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 220 mm bore envelope."
      },
      {
        "q": "What is the difference between NSK VV and DDU seals?",
        "a": "VV is a non-contact rubber seal: low torque, speed close to the open bearing, dust-tight but not liquid-tight. DDU is a contact rubber seal: far better exclusion of moisture and fine dust, at the cost of a lower speed ceiling and higher running torque. 6344 keeps the same ISO 15 envelope either way."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6344-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Same 220×460×88 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "6344-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same 220×460×88 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6344",
      "NSK 6344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "6348",
    "brand": "NSK",
    "manufacturer_designation": "NSK 6348",
    "series": "6300-series",
    "type": "deep_groove",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 515,
    "static_load_kN": 625,
    "weight_g": 94400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 150,
    "standard": "ISO 15",
    "naming_rule_text": "6348 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 48 by five gives the 240 mm bore; the 500 mm outside diameter and 95 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 240 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the NSK catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals).",
    "applications": [
      "pulp and paper machinery",
      "medium and heavy industrial drives",
      "large gearboxes",
      "industrial fans and blowers"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage damage from operation beyond the limiting speed",
      "electrical pitting in VFD-driven motors without grounding protection"
    ],
    "pitfalls": [
      "Large bores like the 240 mm of 6348 demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.",
      "The 63xx medium series gains rating at 240 mm bore through a 500 mm OD and 95 mm width; the heavier rolling elements also trade away some speed versus a 6248.",
      "The open 6348 has no lubricant retention: grease escapes and contaminants migrate straight into the 240×500×95 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Storage matters for open bearings: 6348 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.",
      "Never mix components between two 6348 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.",
      "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 95 mm-wide ring of 6348 drags the lip and overheats it.",
      "The open 6348 has no integral sealing; in the NSK E1103 catalogue the protected variants carry suffixes ZZ (non-contact steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals). NSK does not offer a low-torque contact seal equivalent to NTN's LLH in this catalogue — for high-speed sealed duty specify the VV non-contact seal and an external housing labyrinth.",
      "The 240 mm bore places 6348 at the upper end of NSK's single-row deep-groove catalogue for the E1103 Part C extract; this is a heavy-engineering bearing where centrifugal force and cage inertia dominate the design envelope. NSK supplies a machined brass cage (suffix M) and expects oil lubrication with a defined relubrication interval — do not use catalogue grease speed figures for this size without an NSK engineering review.",
      "NSK rates 6348 at 515 kN dynamic (C) and 625 kN static (C0); this is an extreme-load bearing at the top of the E1103 Part C single-row deep-groove range, where mounting, shaft stiffness and housing alignment dominate the achievable life. Consult NSK engineering for a full application review rather than relying on catalogue L10 alone.",
      "At 94400 g (94.4 kg), 6348 is a very heavy NSK bearing where handling and mounting method directly affect service life; NSK requires induction heating of the inner ring (max 120 °C), a mechanical puller for removal, and a defined lifting procedure to avoid damaging the cage.",
      "The 240×500×95 mm envelope of 6348 gives a D/d ratio of 2.08 and 130.0 mm radial section height — a heavy NSK section built for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.",
      "The 515/625 kN load ratings, mass 94400 g here are NSK Rolling Bearings E1103 Part C catalogue figures for 6348 on the 240×500×95 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6348 in a rated drive. NSK does not tabulate reference or limiting speeds in the E1103 Part C dimension tables used for this page — consult NSK's separate speed-rating tables before high-speed service.",
      "Standard P0 runout from NSK is adequate up to the catalogue limiting speed on ground shaft seats; spindle or instrument positions should specify P6/P5 accuracy explicitly — it is a different order code, not a sorting of standard stock.",
      "When replacing a failed unit, inspect the shaft and housing seats before fitting the new 6348 — a new bearing pressed onto a worn or oval seat reproduces the original failure mode in a fraction of its expected life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 6348 bearing?",
        "a": "A 6348 deep-groove ball bearing has a 240 mm bore, 500 mm outer diameter and 95 mm width (9.449 × 19.685 × 3.74 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields."
      },
      {
        "q": "What lubrication does 6348 need?",
        "a": "The open 6348 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval."
      },
      {
        "q": "How does the 6348 bore code work?",
        "a": "The last two digits of 6348 are bore code 48, giving 48 × 5 = 240 mm bore. The 500 mm outside diameter and 95 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What is the NSK order number for an open 6348?",
        "a": "NSK lists the open 6348 under the bare designation 6348; protected versions use suffixes ZZ (steel shields), VV (non-contact rubber seals) and DDU (contact rubber seals) on the same 240 mm bore envelope."
      },
      {
        "q": "Does the manufacturing plant affect 6348?",
        "a": "NSK produces standard deep-groove sizes in several plants worldwide to the same drawing; the origin on the box label does not change the ISO 15 envelope or the E1103 catalogue ratings quoted here."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6348-M",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×500×95 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting."
      }
    ],
    "source_ref": "https://www.nsk.com/content/dam/nsk/jp/ja/catalogs/pdf/bearings/1103_partc.pdf",
    "catalog_ver": "NSK Rolling Bearings E1103 Part C",
    "extracted_at": "2026-09-24",
    "last_verified": "2026-09-24",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "6348",
      "NSK 6348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "1200",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 9,
    "seal_type": "open",
    "dynamic_load_kN": 5.55,
    "static_load_kN": 1.19,
    "fatigue_load_limit_kN": 0.049,
    "limiting_speed_rpm": 22000,
    "speed_oil_rpm": 28000,
    "weight_g": 34,
    "manufacturer_designation": "1200S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1200S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 9 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small electric motor and fan shafts",
      "domestic appliance drive shafts",
      "power tool spindles",
      "small pump impeller shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 12xx light section at 10 mm bore uses a smaller 30 mm OD than a 1300; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1200 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 9 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1200 self-aligning ball bearing?",
        "a": "A 1200 self-aligning ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1200 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1200?",
        "a": "A bare 1200 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 10 mm bore?",
        "a": "The 12xx is the light section: 30×9 mm with a 10.0 mm radial section at 10 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1200-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2200",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 30,
    "B_mm": 14,
    "seal_type": "open",
    "dynamic_load_kN": 7.45,
    "static_load_kN": 1.59,
    "fatigue_load_limit_kN": 0.067,
    "limiting_speed_rpm": 24000,
    "speed_oil_rpm": 28000,
    "weight_g": 46,
    "manufacturer_designation": "2200S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2200S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2200 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 30 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "garden equipment and light machinery",
      "instrument and office machine drives",
      "small electric motor and fan shafts",
      "domestic appliance drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2200 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 22xx wide-section at 10 mm bore adds load capacity through increased 14 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1200.",
      "The open 2200 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2200 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2200."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2200 self-aligning ball bearing?",
        "a": "A 2200 self-aligning ball bearing has a 10 mm bore, 30 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2200 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2200 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2200?",
        "a": "A bare 2200 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 10 mm bore?",
        "a": "The 22xx is the wide light section: 30×14 mm with a 10.0 mm radial section at 10 mm bore, wider than a 1200 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2200-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 10×30×14 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2200-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1300",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 35,
    "B_mm": 11,
    "seal_type": "open",
    "dynamic_load_kN": 7.35,
    "static_load_kN": 1.62,
    "fatigue_load_limit_kN": 0.074,
    "limiting_speed_rpm": 20000,
    "speed_oil_rpm": 24000,
    "weight_g": 59,
    "manufacturer_designation": "1300S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1300S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "power tool spindles",
      "small pump impeller shafts",
      "garden equipment and light machinery",
      "instrument and office machine drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 13xx medium section at 10 mm bore gains rating through a larger 35 mm OD and 11 mm width; verify the housing accepts the larger envelope before substituting for a 1200.",
      "The open 1300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1300 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1300."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1300 self-aligning ball bearing?",
        "a": "A 1300 self-aligning ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1300 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1300?",
        "a": "A bare 1300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 10 mm bore?",
        "a": "The 13xx is the medium section: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 1200 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1300",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2300",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 10,
    "D_mm": 35,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 9.2,
    "static_load_kN": 2.01,
    "fatigue_load_limit_kN": 0.096,
    "limiting_speed_rpm": 18000,
    "speed_oil_rpm": 22000,
    "weight_g": 78,
    "manufacturer_designation": "2300S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2300S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small electric motor and fan shafts",
      "domestic appliance drive shafts",
      "power tool spindles",
      "small pump impeller shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 23xx heavy wide-section at 10 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2300 has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2300 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2300 self-aligning ball bearing?",
        "a": "A 2300 self-aligning ball bearing has a 10 mm bore, 35 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2300 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2300?",
        "a": "A bare 2300 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 10 mm bore?",
        "a": "The 23xx is the wide heavy section: 35×17 mm, 12.5 mm radial section at 10 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2300",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1201",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 10,
    "seal_type": "open",
    "dynamic_load_kN": 5.7,
    "static_load_kN": 1.27,
    "fatigue_load_limit_kN": 0.053,
    "limiting_speed_rpm": 22000,
    "speed_oil_rpm": 26000,
    "weight_g": 41,
    "manufacturer_designation": "1201S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1201S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 10 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "domestic appliance drive shafts",
      "power tool spindles",
      "small pump impeller shafts",
      "garden equipment and light machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 12xx light section at 12 mm bore uses a smaller 32 mm OD than a 1301; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1201 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1201."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1201 self-aligning ball bearing?",
        "a": "A 1201 self-aligning ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1201 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1201?",
        "a": "A bare 1201 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 12 mm bore?",
        "a": "The 12xx is the light section: 32×10 mm with a 10.0 mm radial section at 12 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1201-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2201",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 14,
    "seal_type": "open",
    "dynamic_load_kN": 7.75,
    "static_load_kN": 1.73,
    "fatigue_load_limit_kN": 0.089,
    "limiting_speed_rpm": 22000,
    "speed_oil_rpm": 26000,
    "weight_g": 51,
    "manufacturer_designation": "2201S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2201S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2201 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "instrument and office machine drives",
      "small electric motor and fan shafts",
      "domestic appliance drive shafts",
      "power tool spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2201 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 22xx wide-section at 12 mm bore adds load capacity through increased 14 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1201.",
      "The open 2201 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2201 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2201 self-aligning ball bearing?",
        "a": "A 2201 self-aligning ball bearing has a 12 mm bore, 32 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2201 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2201 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2201?",
        "a": "A bare 2201 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 12 mm bore?",
        "a": "The 22xx is the wide light section: 32×14 mm with a 10.0 mm radial section at 12 mm bore, wider than a 1201 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2201-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 12×32×14 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2201-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1301",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 9.65,
    "static_load_kN": 2.16,
    "fatigue_load_limit_kN": 0.078,
    "limiting_speed_rpm": 18000,
    "speed_oil_rpm": 22000,
    "weight_g": 68,
    "manufacturer_designation": "1301S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1301S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 12 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small pump impeller shafts",
      "garden equipment and light machinery",
      "instrument and office machine drives",
      "small electric motor and fan shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 13xx medium section at 12 mm bore gains rating through a larger 37 mm OD and 12 mm width; verify the housing accepts the larger envelope before substituting for a 1201.",
      "The open 1301 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1301 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1301."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1301 self-aligning ball bearing?",
        "a": "A 1301 self-aligning ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1301 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1301?",
        "a": "A bare 1301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 12 mm bore?",
        "a": "The 13xx is the medium section: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 1201 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1301-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2301",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 12,
    "D_mm": 37,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 12.1,
    "static_load_kN": 2.73,
    "fatigue_load_limit_kN": 0.12,
    "limiting_speed_rpm": 17000,
    "speed_oil_rpm": 22000,
    "weight_g": 87,
    "manufacturer_designation": "2301S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2301S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2301 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 37 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "domestic appliance drive shafts",
      "power tool spindles",
      "small pump impeller shafts",
      "garden equipment and light machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2301 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 23xx heavy wide-section at 12 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2301 has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2301 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2301-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2301 self-aligning ball bearing?",
        "a": "A 2301 self-aligning ball bearing has a 12 mm bore, 37 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2301 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2301 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2301?",
        "a": "A bare 2301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 12 mm bore?",
        "a": "The 23xx is the wide heavy section: 37×17 mm, 12.5 mm radial section at 12 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2301",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1202",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "seal_type": "open",
    "dynamic_load_kN": 7.6,
    "static_load_kN": 1.75,
    "fatigue_load_limit_kN": 0.072,
    "limiting_speed_rpm": 18000,
    "speed_oil_rpm": 22000,
    "weight_g": 50,
    "manufacturer_designation": "1202S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1202S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "power tool spindles",
      "small pump impeller shafts",
      "garden equipment and light machinery",
      "instrument and office machine drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 12xx light section at 15 mm bore uses a smaller 35 mm OD than a 1302; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1202 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1202 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1202."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1202 self-aligning ball bearing?",
        "a": "A 1202 self-aligning ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1202 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1202?",
        "a": "A bare 1202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 15 mm bore?",
        "a": "The 12xx is the light section: 35×11 mm with a 10.0 mm radial section at 15 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1202-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2202",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 14,
    "seal_type": "open",
    "dynamic_load_kN": 7.8,
    "static_load_kN": 1.85,
    "fatigue_load_limit_kN": 0.095,
    "limiting_speed_rpm": 18000,
    "speed_oil_rpm": 22000,
    "weight_g": 58,
    "manufacturer_designation": "2202S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2202S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2202 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small electric motor and fan shafts",
      "domestic appliance drive shafts",
      "power tool spindles",
      "small pump impeller shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2202 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 22xx wide-section at 15 mm bore adds load capacity through increased 14 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1202.",
      "The open 2202 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2202 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2202-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2202 self-aligning ball bearing?",
        "a": "A 2202 self-aligning ball bearing has a 15 mm bore, 35 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2202 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2202 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2202?",
        "a": "A bare 2202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 15 mm bore?",
        "a": "The 22xx is the wide light section: 35×14 mm with a 10.0 mm radial section at 15 mm bore, wider than a 1202 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2202-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×14 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2202-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×35×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1302",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 13,
    "seal_type": "open",
    "dynamic_load_kN": 9.7,
    "static_load_kN": 2.29,
    "fatigue_load_limit_kN": 0.081,
    "limiting_speed_rpm": 16000,
    "speed_oil_rpm": 20000,
    "weight_g": 101,
    "manufacturer_designation": "1302S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1302S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 13 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "garden equipment and light machinery",
      "instrument and office machine drives",
      "small electric motor and fan shafts",
      "domestic appliance drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 13xx medium section at 15 mm bore gains rating through a larger 42 mm OD and 13 mm width; verify the housing accepts the larger envelope before substituting for a 1202.",
      "The open 1302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×13 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1302 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1302 self-aligning ball bearing?",
        "a": "A 1302 self-aligning ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1302 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1302?",
        "a": "A bare 1302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 15 mm bore?",
        "a": "The 13xx is the medium section: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 1202 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1302-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2302",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 15,
    "D_mm": 42,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 12.3,
    "static_load_kN": 2.91,
    "fatigue_load_limit_kN": 0.13,
    "limiting_speed_rpm": 14000,
    "speed_oil_rpm": 18000,
    "weight_g": 113,
    "manufacturer_designation": "2302S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2302S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2302 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 42 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "power tool spindles",
      "small pump impeller shafts",
      "garden equipment and light machinery",
      "instrument and office machine drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2302 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 23xx heavy wide-section at 15 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2302 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×42×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2302 units.",
      "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2302 self-aligning ball bearing?",
        "a": "A 2302 self-aligning ball bearing has a 15 mm bore, 42 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2302 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2302 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2302?",
        "a": "A bare 2302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 15 mm bore?",
        "a": "The 23xx is the wide heavy section: 42×17 mm, 13.5 mm radial section at 15 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2302-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 15×42×17 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      }
    ]
  },
  {
    "sku": "1203",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 8,
    "static_load_kN": 2.01,
    "fatigue_load_limit_kN": 0.083,
    "limiting_speed_rpm": 16000,
    "speed_oil_rpm": 20000,
    "weight_g": 74,
    "manufacturer_designation": "1203S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1203S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 12 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small pump impeller shafts",
      "garden equipment and light machinery",
      "instrument and office machine drives",
      "small electric motor and fan shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 12xx light section at 17 mm bore uses a smaller 40 mm OD than a 1303; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1203 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1203 self-aligning ball bearing?",
        "a": "A 1203 self-aligning ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1203 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1203?",
        "a": "A bare 1203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 17 mm bore?",
        "a": "The 12xx is the light section: 40×12 mm with an 11.5 mm radial section at 17 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1203-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2203",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 9.95,
    "static_load_kN": 2.42,
    "fatigue_load_limit_kN": 0.13,
    "limiting_speed_rpm": 16000,
    "speed_oil_rpm": 20000,
    "weight_g": 89,
    "manufacturer_designation": "2203S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2203S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2203 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 40 mm and width 16 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "domestic appliance drive shafts",
      "power tool spindles",
      "small pump impeller shafts",
      "garden equipment and light machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2203 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 22xx wide-section at 17 mm bore adds load capacity through increased 16 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1203.",
      "The open 2203 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×40×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2203 units.",
      "A 17 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2203 self-aligning ball bearing?",
        "a": "A 2203 self-aligning ball bearing has a 17 mm bore, 40 mm outer diameter and 16 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2203 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2203 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2203?",
        "a": "A bare 2203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 17 mm bore?",
        "a": "The 22xx is the wide light section: 40×16 mm with an 11.5 mm radial section at 17 mm bore, wider than a 1203 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2203-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×40×16 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2203-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1303",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "seal_type": "open",
    "dynamic_load_kN": 12.7,
    "static_load_kN": 3.2,
    "fatigue_load_limit_kN": 0.11,
    "limiting_speed_rpm": 14000,
    "speed_oil_rpm": 17000,
    "weight_g": 130,
    "manufacturer_designation": "1303S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1303S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "instrument and office machine drives",
      "small electric motor and fan shafts",
      "domestic appliance drive shafts",
      "power tool spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 1303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 13xx medium section at 17 mm bore gains rating through a larger 47 mm OD and 14 mm width; verify the housing accepts the larger envelope before substituting for a 1203.",
      "The open 1303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1303 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1303-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1303 self-aligning ball bearing?",
        "a": "A 1303 self-aligning ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 1303 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 1303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 1303?",
        "a": "A bare 1303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 17 mm bore?",
        "a": "The 13xx is the medium section: 47×14 mm, 15.0 mm radial section at 17 mm bore, carrying more load than a 1203 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1303-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2303",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 19,
    "seal_type": "open",
    "dynamic_load_kN": 14.7,
    "static_load_kN": 3.55,
    "fatigue_load_limit_kN": 0.16,
    "limiting_speed_rpm": 13000,
    "speed_oil_rpm": 16000,
    "weight_g": 160,
    "manufacturer_designation": "2303S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2303S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2303 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 47 mm and width 19 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small pump impeller shafts",
      "garden equipment and light machinery",
      "instrument and office machine drives",
      "small electric motor and fan shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Bore codes 00–03 use the exception table: 2303 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).",
      "The 23xx heavy wide-section at 17 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2303 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2303 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2303 self-aligning ball bearing?",
        "a": "A 2303 self-aligning ball bearing has a 17 mm bore, 47 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "Why does 2303 not follow the bore-code × 5 rule?",
        "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 2303 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)."
      },
      {
        "q": "What does the open suffix mean on 2303?",
        "a": "A bare 2303 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 17 mm bore?",
        "a": "The 23xx is the wide heavy section: 47×19 mm, 15.0 mm radial section at 17 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2303-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 17×47×19 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2303-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1204",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "seal_type": "open",
    "dynamic_load_kN": 10,
    "static_load_kN": 2.61,
    "fatigue_load_limit_kN": 0.11,
    "limiting_speed_rpm": 14000,
    "speed_oil_rpm": 17000,
    "weight_g": 120,
    "manufacturer_designation": "1204S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1204S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 20 mm bore uses a smaller 47 mm OD than a 1304; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1204 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1204 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1204-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1204 self-aligning ball bearing?",
        "a": "A 1204 self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1204 bore code work?",
        "a": "The last two digits of 1204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1204?",
        "a": "A bare 1204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 12xx is the light section: 47×14 mm with a 13.5 mm radial section at 20 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1204-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1204-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1204K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "seal_type": "open",
    "dynamic_load_kN": 10,
    "static_load_kN": 2.61,
    "fatigue_load_limit_kN": 0.11,
    "limiting_speed_rpm": 14000,
    "speed_oil_rpm": 17000,
    "weight_g": 120,
    "manufacturer_designation": "1204SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1204SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 14 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1204. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1204K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 20 mm bore uses a smaller 47 mm OD than a 1304; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1204K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 14 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1204K self-aligning ball bearing?",
        "a": "A 1204K self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 14 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1204."
      },
      {
        "q": "How does the 1204 bore code work?",
        "a": "The last two digits of 1204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1204K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1204. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 12xx is the light section: 47×14 mm with a 13.5 mm radial section at 20 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1204K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2204",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 18,
    "seal_type": "open",
    "dynamic_load_kN": 12.8,
    "static_load_kN": 3.3,
    "fatigue_load_limit_kN": 0.14,
    "limiting_speed_rpm": 14000,
    "speed_oil_rpm": 17000,
    "weight_g": 142,
    "manufacturer_designation": "2204S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2204S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 18 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2204; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 20 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1204.",
      "The open 2204 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×47×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2204 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2204 self-aligning ball bearing?",
        "a": "A 2204 self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2204 bore code work?",
        "a": "The last two digits of 2204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2204?",
        "a": "A bare 2204 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 22xx is the wide light section: 47×18 mm with a 13.5 mm radial section at 20 mm bore, wider than a 1204 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2204-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×18 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2204-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×47×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2204K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 18,
    "seal_type": "open",
    "dynamic_load_kN": 12.8,
    "static_load_kN": 3.3,
    "fatigue_load_limit_kN": 0.14,
    "limiting_speed_rpm": 14000,
    "speed_oil_rpm": 17000,
    "weight_g": 142,
    "manufacturer_designation": "2204SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2204SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2204 carries bore code 04 = 20 mm. Outside diameter 47 mm and width 18 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2204. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2204K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 20 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1204.",
      "Tapered-bore 2204K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2204K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2204K self-aligning ball bearing?",
        "a": "A 2204K self-aligning ball bearing has a 20 mm bore, 47 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2204."
      },
      {
        "q": "How does the 2204 bore code work?",
        "a": "The last two digits of 2204 are bore code 04, giving 04 × 5 = 20 mm bore. The 47 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2204K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2204. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 22xx is the wide light section: 47×18 mm with a 13.5 mm radial section at 20 mm bore, wider than a 1204 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2204K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1304",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "open",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 3.35,
    "fatigue_load_limit_kN": 0.14,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 15000,
    "weight_g": 164,
    "manufacturer_designation": "1304S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1304S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1304; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 20 mm bore gains rating through a larger 52 mm OD and 15 mm width; verify the housing accepts the larger envelope before substituting for a 1204.",
      "The open 1304 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1304 units.",
      "A 20 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1304 self-aligning ball bearing?",
        "a": "A 1304 self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1304 bore code work?",
        "a": "The last two digits of 1304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1304?",
        "a": "A bare 1304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 13xx is the medium section: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 1204 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1304-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1304K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "open",
    "dynamic_load_kN": 12.6,
    "static_load_kN": 3.35,
    "fatigue_load_limit_kN": 0.14,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 15000,
    "weight_g": 164,
    "manufacturer_designation": "1304SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1304SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1304. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1304K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 20 mm bore gains rating through a larger 52 mm OD and 15 mm width; verify the housing accepts the larger envelope before substituting for a 1204.",
      "Tapered-bore 1304K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1304K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1304K self-aligning ball bearing?",
        "a": "A 1304K self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1304."
      },
      {
        "q": "How does the 1304 bore code work?",
        "a": "The last two digits of 1304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1304K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1304. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 13xx is the medium section: 52×15 mm, 16.0 mm radial section at 20 mm bore, carrying more load than a 1204 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1304K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2304",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 21,
    "seal_type": "open",
    "dynamic_load_kN": 18.5,
    "static_load_kN": 4.7,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 14000,
    "weight_g": 207,
    "manufacturer_designation": "2304S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2304S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 21 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2304; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 20 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2304 has no lubricant retention: grease escapes and contaminants migrate straight into the 20×52×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2304 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2304."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2304 self-aligning ball bearing?",
        "a": "A 2304 self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2304 bore code work?",
        "a": "The last two digits of 2304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2304?",
        "a": "A bare 2304 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 23xx is the wide heavy section: 52×21 mm, 16.0 mm radial section at 20 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2304-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 20×52×21 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2304-TN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2304K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 21,
    "seal_type": "open",
    "dynamic_load_kN": 18.5,
    "static_load_kN": 4.7,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 14000,
    "weight_g": 207,
    "manufacturer_designation": "2304SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2304SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2304 carries bore code 04 = 20 mm. Outside diameter 52 mm and width 21 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2304. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 20 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2304K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 20 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2304K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 20 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2304K self-aligning ball bearing?",
        "a": "A 2304K self-aligning ball bearing has a 20 mm bore, 52 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2304."
      },
      {
        "q": "How does the 2304 bore code work?",
        "a": "The last two digits of 2304 are bore code 04, giving 04 × 5 = 20 mm bore. The 52 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2304K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2304. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 20 mm bore?",
        "a": "The 23xx is the wide heavy section: 52×21 mm, 16.0 mm radial section at 20 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2304K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1205",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "open",
    "dynamic_load_kN": 12.2,
    "static_load_kN": 3.3,
    "fatigue_load_limit_kN": 0.13,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 14000,
    "weight_g": 140,
    "manufacturer_designation": "1205S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1205S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1205; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 25 mm bore uses a smaller 52 mm OD than a 1305; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×15 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1205 units.",
      "A 25 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1205 self-aligning ball bearing?",
        "a": "A 1205 self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1205 bore code work?",
        "a": "The last two digits of 1205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1205?",
        "a": "A bare 1205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 12xx is the light section: 52×15 mm with a 13.5 mm radial section at 25 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1205-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1205-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1205K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "seal_type": "open",
    "dynamic_load_kN": 12.2,
    "static_load_kN": 3.3,
    "fatigue_load_limit_kN": 0.13,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 14000,
    "weight_g": 140,
    "manufacturer_designation": "1205SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1205SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 15 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1205. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1205K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 25 mm bore uses a smaller 52 mm OD than a 1305; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1205K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1205K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1205K self-aligning ball bearing?",
        "a": "A 1205K self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 15 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1205."
      },
      {
        "q": "How does the 1205 bore code work?",
        "a": "The last two digits of 1205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 15 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1205K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1205. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 12xx is the light section: 52×15 mm with a 13.5 mm radial section at 25 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1205K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2205",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "seal_type": "open",
    "dynamic_load_kN": 12.4,
    "static_load_kN": 3.45,
    "fatigue_load_limit_kN": 0.2,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 14000,
    "weight_g": 160,
    "manufacturer_designation": "2205S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2205S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 18 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2205; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 25 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1205.",
      "The open 2205 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×52×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2205 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2205."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2205 self-aligning ball bearing?",
        "a": "A 2205 self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2205 bore code work?",
        "a": "The last two digits of 2205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2205?",
        "a": "A bare 2205 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 22xx is the wide light section: 52×18 mm with a 13.5 mm radial section at 25 mm bore, wider than a 1205 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2205-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2205-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2205-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2205-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×52×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2205K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "seal_type": "open",
    "dynamic_load_kN": 12.4,
    "static_load_kN": 3.45,
    "fatigue_load_limit_kN": 0.2,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 14000,
    "weight_g": 160,
    "manufacturer_designation": "2205SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2205SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2205 carries bore code 05 = 25 mm. Outside diameter 52 mm and width 18 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2205. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2205K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 25 mm bore adds load capacity through increased 18 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1205.",
      "Tapered-bore 2205K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2205K self-aligning ball bearing?",
        "a": "A 2205K self-aligning ball bearing has a 25 mm bore, 52 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2205."
      },
      {
        "q": "How does the 2205 bore code work?",
        "a": "The last two digits of 2205 are bore code 05, giving 05 × 5 = 25 mm bore. The 52 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2205K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2205. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 22xx is the wide light section: 52×18 mm with a 13.5 mm radial section at 25 mm bore, wider than a 1205 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2205K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1305",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 18.2,
    "static_load_kN": 5,
    "fatigue_load_limit_kN": 0.15,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 13000,
    "weight_g": 261,
    "manufacturer_designation": "1305S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1305S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1305; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 25 mm bore gains rating through a larger 62 mm OD and 17 mm width; verify the housing accepts the larger envelope before substituting for a 1205.",
      "The open 1305 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1305 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 17 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1305 self-aligning ball bearing?",
        "a": "A 1305 self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1305 bore code work?",
        "a": "The last two digits of 1305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1305?",
        "a": "A bare 1305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 13xx is the medium section: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 1205 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1305-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1305-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1305K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 18.2,
    "static_load_kN": 5,
    "fatigue_load_limit_kN": 0.15,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 13000,
    "weight_g": 261,
    "manufacturer_designation": "1305SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1305SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 17 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1305. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1305K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 25 mm bore gains rating through a larger 62 mm OD and 17 mm width; verify the housing accepts the larger envelope before substituting for a 1205.",
      "Tapered-bore 1305K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1305K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1305K self-aligning ball bearing?",
        "a": "A 1305K self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1305."
      },
      {
        "q": "How does the 1305 bore code work?",
        "a": "The last two digits of 1305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1305K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1305. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 13xx is the medium section: 62×17 mm, 18.5 mm radial section at 25 mm bore, carrying more load than a 1205 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1305K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2305",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "seal_type": "open",
    "dynamic_load_kN": 24.9,
    "static_load_kN": 6.6,
    "fatigue_load_limit_kN": 0.29,
    "limiting_speed_rpm": 9500,
    "speed_oil_rpm": 12000,
    "weight_g": 332,
    "manufacturer_designation": "2305S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2305S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 24 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2305; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 25 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2305 has no lubricant retention: grease escapes and contaminants migrate straight into the 25×62×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2305 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2305."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2305 self-aligning ball bearing?",
        "a": "A 2305 self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 24 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2305 bore code work?",
        "a": "The last two digits of 2305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2305?",
        "a": "A bare 2305 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 23xx is the wide heavy section: 62×24 mm, 18.5 mm radial section at 25 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2305-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2305-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×62×24 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2305-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2305-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2305K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "seal_type": "open",
    "dynamic_load_kN": 24.9,
    "static_load_kN": 6.6,
    "fatigue_load_limit_kN": 0.29,
    "limiting_speed_rpm": 9500,
    "speed_oil_rpm": 12000,
    "weight_g": 332,
    "manufacturer_designation": "2305SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2305SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2305 carries bore code 05 = 25 mm. Outside diameter 62 mm and width 24 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2305. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 25 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2305K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 25 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2305K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 25 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2305-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2305K self-aligning ball bearing?",
        "a": "A 2305K self-aligning ball bearing has a 25 mm bore, 62 mm outer diameter and 24 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2305."
      },
      {
        "q": "How does the 2305 bore code work?",
        "a": "The last two digits of 2305 are bore code 05, giving 05 × 5 = 25 mm bore. The 62 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2305K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2305. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 25 mm bore?",
        "a": "The 23xx is the wide heavy section: 62×24 mm, 18.5 mm radial section at 25 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2305K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1206",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 15.8,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.19,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 12000,
    "weight_g": 220,
    "manufacturer_designation": "1206S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1206S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 30 mm bore uses a smaller 62 mm OD than a 1306; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×16 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1206 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1206 self-aligning ball bearing?",
        "a": "A 1206 self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1206 bore code work?",
        "a": "The last two digits of 1206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1206?",
        "a": "A bare 1206 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 12xx is the light section: 62×16 mm with a 16.0 mm radial section at 30 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1206-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1206-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1206K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 15.8,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.19,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 12000,
    "weight_g": 220,
    "manufacturer_designation": "1206SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1206SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 16 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1206. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1206K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 30 mm bore uses a smaller 62 mm OD than a 1306; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1206K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1206K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1206K self-aligning ball bearing?",
        "a": "A 1206K self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 16 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1206."
      },
      {
        "q": "How does the 1206 bore code work?",
        "a": "The last two digits of 1206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 16 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1206K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1206. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 12xx is the light section: 62×16 mm with a 16.0 mm radial section at 30 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1206K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2206",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 15.3,
    "static_load_kN": 4.55,
    "fatigue_load_limit_kN": 0.26,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 12000,
    "weight_g": 262,
    "manufacturer_designation": "2206S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2206S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 20 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2206; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 30 mm bore adds load capacity through increased 20 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1206.",
      "The open 2206 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×62×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2206 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2206."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2206 self-aligning ball bearing?",
        "a": "A 2206 self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2206 bore code work?",
        "a": "The last two digits of 2206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2206?",
        "a": "A bare 2206 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 22xx is the wide light section: 62×20 mm with a 16.0 mm radial section at 30 mm bore, wider than a 1206 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2206-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2206-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2206-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2206-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×62×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2206K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 15.3,
    "static_load_kN": 4.55,
    "fatigue_load_limit_kN": 0.26,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 12000,
    "weight_g": 262,
    "manufacturer_designation": "2206SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2206SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2206 carries bore code 06 = 30 mm. Outside diameter 62 mm and width 20 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2206. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2206K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 30 mm bore adds load capacity through increased 20 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1206.",
      "Tapered-bore 2206K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2206-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2206K self-aligning ball bearing?",
        "a": "A 2206K self-aligning ball bearing has a 30 mm bore, 62 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2206."
      },
      {
        "q": "How does the 2206 bore code work?",
        "a": "The last two digits of 2206 are bore code 06, giving 06 × 5 = 30 mm bore. The 62 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2206K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2206. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 22xx is the wide light section: 62×20 mm with a 16.0 mm radial section at 30 mm bore, wider than a 1206 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2206K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1306",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "seal_type": "open",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 6.3,
    "fatigue_load_limit_kN": 0.19,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 11000,
    "weight_g": 391,
    "manufacturer_designation": "1306S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1306S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1306; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 30 mm bore gains rating through a larger 72 mm OD and 19 mm width; verify the housing accepts the larger envelope before substituting for a 1206.",
      "The open 1306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1306 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1306."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1306 self-aligning ball bearing?",
        "a": "A 1306 self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1306 bore code work?",
        "a": "The last two digits of 1306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1306?",
        "a": "A bare 1306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 13xx is the medium section: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 1206 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1306-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1306-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1306K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "seal_type": "open",
    "dynamic_load_kN": 21.4,
    "static_load_kN": 6.3,
    "fatigue_load_limit_kN": 0.19,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 11000,
    "weight_g": 391,
    "manufacturer_designation": "1306SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1306SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 19 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1306. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1306K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 30 mm bore gains rating through a larger 72 mm OD and 19 mm width; verify the housing accepts the larger envelope before substituting for a 1206.",
      "Tapered-bore 1306K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1306K self-aligning ball bearing?",
        "a": "A 1306K self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1306."
      },
      {
        "q": "How does the 1306 bore code work?",
        "a": "The last two digits of 1306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1306K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1306. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 13xx is the medium section: 72×19 mm, 21.0 mm radial section at 30 mm bore, carrying more load than a 1206 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1306K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2306",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "seal_type": "open",
    "dynamic_load_kN": 32,
    "static_load_kN": 8.75,
    "fatigue_load_limit_kN": 0.38,
    "limiting_speed_rpm": 8000,
    "speed_oil_rpm": 10000,
    "weight_g": 500,
    "manufacturer_designation": "2306S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2306S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 27 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2306; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 30 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2306 has no lubricant retention: grease escapes and contaminants migrate straight into the 30×72×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2306 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2306 self-aligning ball bearing?",
        "a": "A 2306 self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2306 bore code work?",
        "a": "The last two digits of 2306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2306?",
        "a": "A bare 2306 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 23xx is the wide heavy section: 72×27 mm, 21.0 mm radial section at 30 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2306-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2306-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 30×72×27 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2306-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2306K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "seal_type": "open",
    "dynamic_load_kN": 32,
    "static_load_kN": 8.75,
    "fatigue_load_limit_kN": 0.38,
    "limiting_speed_rpm": 8000,
    "speed_oil_rpm": 10000,
    "weight_g": 500,
    "manufacturer_designation": "2306SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2306SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2306 carries bore code 06 = 30 mm. Outside diameter 72 mm and width 27 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2306. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2306K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 30 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2306K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 30 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 30 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2306K self-aligning ball bearing?",
        "a": "A 2306K self-aligning ball bearing has a 30 mm bore, 72 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2306."
      },
      {
        "q": "How does the 2306 bore code work?",
        "a": "The last two digits of 2306 are bore code 06, giving 06 × 5 = 30 mm bore. The 72 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2306K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2306. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 30 mm bore?",
        "a": "The 23xx is the wide heavy section: 72×27 mm, 21.0 mm radial section at 30 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2306K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1207",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 5.1,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 10000,
    "weight_g": 330,
    "manufacturer_designation": "1207S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1207S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1207; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 35 mm bore uses a smaller 72 mm OD than a 1307; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×17 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1207 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1207."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1207 self-aligning ball bearing?",
        "a": "A 1207 self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1207 bore code work?",
        "a": "The last two digits of 1207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1207?",
        "a": "A bare 1207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 12xx is the light section: 72×17 mm with an 18.5 mm radial section at 35 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1207-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1207-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1207K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "seal_type": "open",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 5.1,
    "fatigue_load_limit_kN": 0.21,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 10000,
    "weight_g": 330,
    "manufacturer_designation": "1207SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1207SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 17 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1207. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1207K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 35 mm bore uses a smaller 72 mm OD than a 1307; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1207K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1207K self-aligning ball bearing?",
        "a": "A 1207K self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 17 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1207."
      },
      {
        "q": "How does the 1207 bore code work?",
        "a": "The last two digits of 1207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 17 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1207K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1207. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 12xx is the light section: 72×17 mm with an 18.5 mm radial section at 35 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1207K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2207",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 21.7,
    "static_load_kN": 6.6,
    "fatigue_load_limit_kN": 0.32,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 10000,
    "weight_g": 403,
    "manufacturer_designation": "2207S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2207S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2207; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 35 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1207.",
      "The open 2207 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×72×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2207 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2207 self-aligning ball bearing?",
        "a": "A 2207 self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2207 bore code work?",
        "a": "The last two digits of 2207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2207?",
        "a": "A bare 2207 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 22xx is the wide light section: 72×23 mm with an 18.5 mm radial section at 35 mm bore, wider than a 1207 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2207-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2207-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2207-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2207-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×72×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2207K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 21.7,
    "static_load_kN": 6.6,
    "fatigue_load_limit_kN": 0.32,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 10000,
    "weight_g": 403,
    "manufacturer_designation": "2207SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2207SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2207 carries bore code 07 = 35 mm. Outside diameter 72 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2207. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2207K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 35 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1207.",
      "Tapered-bore 2207K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 35 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2207K self-aligning ball bearing?",
        "a": "A 2207K self-aligning ball bearing has a 35 mm bore, 72 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2207."
      },
      {
        "q": "How does the 2207 bore code work?",
        "a": "The last two digits of 2207 are bore code 07, giving 07 × 5 = 35 mm bore. The 72 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2207K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2207. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 22xx is the wide light section: 72×23 mm with an 18.5 mm radial section at 35 mm bore, wider than a 1207 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2207K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1307",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "seal_type": "open",
    "dynamic_load_kN": 25.3,
    "static_load_kN": 7.85,
    "fatigue_load_limit_kN": 0.28,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 9500,
    "weight_g": 520,
    "manufacturer_designation": "1307S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1307S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1307; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 35 mm bore gains rating through a larger 80 mm OD and 21 mm width; verify the housing accepts the larger envelope before substituting for a 1207.",
      "The open 1307 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1307 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1307."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1307 self-aligning ball bearing?",
        "a": "A 1307 self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1307 bore code work?",
        "a": "The last two digits of 1307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1307?",
        "a": "A bare 1307 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 13xx is the medium section: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 1207 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1307-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1307-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1307K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "seal_type": "open",
    "dynamic_load_kN": 25.3,
    "static_load_kN": 7.85,
    "fatigue_load_limit_kN": 0.28,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 9500,
    "weight_g": 520,
    "manufacturer_designation": "1307SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1307SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 21 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1307. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1307K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 35 mm bore gains rating through a larger 80 mm OD and 21 mm width; verify the housing accepts the larger envelope before substituting for a 1207.",
      "Tapered-bore 1307K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1307-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1307K self-aligning ball bearing?",
        "a": "A 1307K self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1307."
      },
      {
        "q": "How does the 1307 bore code work?",
        "a": "The last two digits of 1307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1307K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1307. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 13xx is the medium section: 80×21 mm, 22.5 mm radial section at 35 mm bore, carrying more load than a 1207 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1307K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2307",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 40,
    "static_load_kN": 11.3,
    "fatigue_load_limit_kN": 0.48,
    "limiting_speed_rpm": 7100,
    "speed_oil_rpm": 9000,
    "weight_g": 671,
    "manufacturer_designation": "2307S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2307S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2307; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 35 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2307 has no lubricant retention: grease escapes and contaminants migrate straight into the 35×80×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2307 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2307-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2307 self-aligning ball bearing?",
        "a": "A 2307 self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2307 bore code work?",
        "a": "The last two digits of 2307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2307?",
        "a": "A bare 2307 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 23xx is the wide heavy section: 80×31 mm, 22.5 mm radial section at 35 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2307-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2307-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×80×31 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2307-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2307-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2307K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 40,
    "static_load_kN": 11.3,
    "fatigue_load_limit_kN": 0.48,
    "limiting_speed_rpm": 7100,
    "speed_oil_rpm": 9000,
    "weight_g": 671,
    "manufacturer_designation": "2307SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2307SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2307 carries bore code 07 = 35 mm. Outside diameter 80 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2307. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 35 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2307K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 35 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2307K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 35 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2307K self-aligning ball bearing?",
        "a": "A 2307K self-aligning ball bearing has a 35 mm bore, 80 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2307."
      },
      {
        "q": "How does the 2307 bore code work?",
        "a": "The last two digits of 2307 are bore code 07, giving 07 × 5 = 35 mm bore. The 80 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2307K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2307. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 35 mm bore?",
        "a": "The 23xx is the wide heavy section: 80×31 mm, 22.5 mm radial section at 35 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2307K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1208",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "seal_type": "open",
    "dynamic_load_kN": 19.3,
    "static_load_kN": 6.5,
    "fatigue_load_limit_kN": 0.26,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 9000,
    "weight_g": 420,
    "manufacturer_designation": "1208S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1208S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 40 mm bore uses a smaller 80 mm OD than a 1308; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×18 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1208 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1208."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1208 self-aligning ball bearing?",
        "a": "A 1208 self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1208 bore code work?",
        "a": "The last two digits of 1208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1208?",
        "a": "A bare 1208 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 12xx is the light section: 80×18 mm with a 20.0 mm radial section at 40 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1208-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1208-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1208K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "seal_type": "open",
    "dynamic_load_kN": 19.3,
    "static_load_kN": 6.5,
    "fatigue_load_limit_kN": 0.26,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 9000,
    "weight_g": 420,
    "manufacturer_designation": "1208SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1208SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 18 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1208. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1208K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 40 mm bore uses a smaller 80 mm OD than a 1308; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1208K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1208-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1208K self-aligning ball bearing?",
        "a": "A 1208K self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 18 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1208."
      },
      {
        "q": "How does the 1208 bore code work?",
        "a": "The last two digits of 1208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 18 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1208K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1208. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 12xx is the light section: 80×18 mm with a 20.0 mm radial section at 40 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1208K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2208",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 22.4,
    "static_load_kN": 7.35,
    "fatigue_load_limit_kN": 0.39,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 9000,
    "weight_g": 506,
    "manufacturer_designation": "2208S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2208S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2208; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 40 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1208.",
      "The open 2208 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×80×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2208 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2208-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2208 self-aligning ball bearing?",
        "a": "A 2208 self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2208 bore code work?",
        "a": "The last two digits of 2208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2208?",
        "a": "A bare 2208 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 22xx is the wide light section: 80×23 mm with a 20.0 mm radial section at 40 mm bore, wider than a 1208 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2208-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2208-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2208-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2208-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2208K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 22.4,
    "static_load_kN": 7.35,
    "fatigue_load_limit_kN": 0.39,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 9000,
    "weight_g": 506,
    "manufacturer_designation": "2208SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2208SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2208 carries bore code 08 = 40 mm. Outside diameter 80 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2208. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2208K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 40 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1208.",
      "Tapered-bore 2208K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2208K self-aligning ball bearing?",
        "a": "A 2208K self-aligning ball bearing has a 40 mm bore, 80 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2208."
      },
      {
        "q": "How does the 2208 bore code work?",
        "a": "The last two digits of 2208 are bore code 08, giving 08 × 5 = 40 mm bore. The 80 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2208K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2208. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 22xx is the wide light section: 80×23 mm with a 20.0 mm radial section at 40 mm bore, wider than a 1208 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2208K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1308",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 29.8,
    "static_load_kN": 9.7,
    "fatigue_load_limit_kN": 0.3,
    "limiting_speed_rpm": 6700,
    "speed_oil_rpm": 8500,
    "weight_g": 727,
    "manufacturer_designation": "1308S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1308S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 40 mm bore gains rating through a larger 90 mm OD and 23 mm width; verify the housing accepts the larger envelope before substituting for a 1208.",
      "The open 1308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1308 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1308 self-aligning ball bearing?",
        "a": "A 1308 self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1308 bore code work?",
        "a": "The last two digits of 1308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1308?",
        "a": "A bare 1308 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 13xx is the medium section: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 1208 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1308-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1308-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1308K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 29.8,
    "static_load_kN": 9.7,
    "fatigue_load_limit_kN": 0.3,
    "limiting_speed_rpm": 6700,
    "speed_oil_rpm": 8500,
    "weight_g": 727,
    "manufacturer_designation": "1308SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1308SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1308. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1308K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 40 mm bore gains rating through a larger 90 mm OD and 23 mm width; verify the housing accepts the larger envelope before substituting for a 1208.",
      "Tapered-bore 1308K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1308K self-aligning ball bearing?",
        "a": "A 1308K self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1308."
      },
      {
        "q": "How does the 1308 bore code work?",
        "a": "The last two digits of 1308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1308K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1308. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 13xx is the medium section: 90×23 mm, 25.0 mm radial section at 40 mm bore, carrying more load than a 1208 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1308K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2308",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "seal_type": "open",
    "dynamic_load_kN": 45.5,
    "static_load_kN": 13.5,
    "fatigue_load_limit_kN": 0.58,
    "limiting_speed_rpm": 6300,
    "speed_oil_rpm": 8000,
    "weight_g": 918,
    "manufacturer_designation": "2308S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2308S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 33 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2308; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 40 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2308 has no lubricant retention: grease escapes and contaminants migrate straight into the 40×90×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2308 units.",
      "A 40 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2308 self-aligning ball bearing?",
        "a": "A 2308 self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2308 bore code work?",
        "a": "The last two digits of 2308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2308?",
        "a": "A bare 2308 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 23xx is the wide heavy section: 90×33 mm, 25.0 mm radial section at 40 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2308-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2308-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2308-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2308-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2308K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "seal_type": "open",
    "dynamic_load_kN": 45.5,
    "static_load_kN": 13.5,
    "fatigue_load_limit_kN": 0.58,
    "limiting_speed_rpm": 6300,
    "speed_oil_rpm": 8000,
    "weight_g": 918,
    "manufacturer_designation": "2308SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2308SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2308 carries bore code 08 = 40 mm. Outside diameter 90 mm and width 33 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2308. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 40 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2308K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 40 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2308K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 40 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2308K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2308K self-aligning ball bearing?",
        "a": "A 2308K self-aligning ball bearing has a 40 mm bore, 90 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2308."
      },
      {
        "q": "How does the 2308 bore code work?",
        "a": "The last two digits of 2308 are bore code 08, giving 08 × 5 = 40 mm bore. The 90 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2308K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2308. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 40 mm bore?",
        "a": "The 23xx is the wide heavy section: 90×33 mm, 25.0 mm radial section at 40 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2308K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1209",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "seal_type": "open",
    "dynamic_load_kN": 22,
    "static_load_kN": 7.35,
    "fatigue_load_limit_kN": 0.29,
    "limiting_speed_rpm": 7100,
    "speed_oil_rpm": 8500,
    "weight_g": 470,
    "manufacturer_designation": "1209S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1209S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1209; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 45 mm bore uses a smaller 85 mm OD than a 1309; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×19 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1209 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1209 self-aligning ball bearing?",
        "a": "A 1209 self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1209 bore code work?",
        "a": "The last two digits of 1209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1209?",
        "a": "A bare 1209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 12xx is the light section: 85×19 mm with a 20.0 mm radial section at 45 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1209-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1209-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1209K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "seal_type": "open",
    "dynamic_load_kN": 22,
    "static_load_kN": 7.35,
    "fatigue_load_limit_kN": 0.29,
    "limiting_speed_rpm": 7100,
    "speed_oil_rpm": 8500,
    "weight_g": 470,
    "manufacturer_designation": "1209SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1209SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 19 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1209. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1209K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 12xx light section at 45 mm bore uses a smaller 85 mm OD than a 1309; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1209K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1209K self-aligning ball bearing?",
        "a": "A 1209K self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 19 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1209."
      },
      {
        "q": "How does the 1209 bore code work?",
        "a": "The last two digits of 1209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 19 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1209K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1209. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 12xx is the light section: 85×19 mm with a 20.0 mm radial section at 45 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1209K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2209",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 23.3,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.51,
    "limiting_speed_rpm": 7100,
    "speed_oil_rpm": 8500,
    "weight_g": 556,
    "manufacturer_designation": "2209S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2209S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2209; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 45 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1209.",
      "The open 2209 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×85×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2209 units.",
      "A 45 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2209 self-aligning ball bearing?",
        "a": "A 2209 self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2209 bore code work?",
        "a": "The last two digits of 2209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2209?",
        "a": "A bare 2209 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 22xx is the wide light section: 85×23 mm with a 20.0 mm radial section at 45 mm bore, wider than a 1209 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2209-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2209-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2209-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2209-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2209K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 23.3,
    "static_load_kN": 8.15,
    "fatigue_load_limit_kN": 0.51,
    "limiting_speed_rpm": 7100,
    "speed_oil_rpm": 8500,
    "weight_g": 556,
    "manufacturer_designation": "2209SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2209SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2209 carries bore code 09 = 45 mm. Outside diameter 85 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2209. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2209K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 22xx wide-section at 45 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1209.",
      "Tapered-bore 2209K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2209K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2209K self-aligning ball bearing?",
        "a": "A 2209K self-aligning ball bearing has a 45 mm bore, 85 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2209."
      },
      {
        "q": "How does the 2209 bore code work?",
        "a": "The last two digits of 2209 are bore code 09, giving 09 × 5 = 45 mm bore. The 85 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2209K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2209. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 22xx is the wide light section: 85×23 mm with a 20.0 mm radial section at 45 mm bore, wider than a 1209 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2209K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1309",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 12.7,
    "fatigue_load_limit_kN": 0.33,
    "limiting_speed_rpm": 6000,
    "speed_oil_rpm": 7500,
    "weight_g": 971,
    "manufacturer_designation": "1309S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1309S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1309; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 45 mm bore gains rating through a larger 100 mm OD and 25 mm width; verify the housing accepts the larger envelope before substituting for a 1209.",
      "The open 1309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1309 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1309-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1309 self-aligning ball bearing?",
        "a": "A 1309 self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1309 bore code work?",
        "a": "The last two digits of 1309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1309?",
        "a": "A bare 1309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 13xx is the medium section: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 1209 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1309-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1309-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1309K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 12.7,
    "fatigue_load_limit_kN": 0.33,
    "limiting_speed_rpm": 6000,
    "speed_oil_rpm": 7500,
    "weight_g": 971,
    "manufacturer_designation": "1309SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1309SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1309. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "electric motors and generators",
      "centrifugal pump shafts",
      "small gearbox input/output shafts",
      "conveyor roller and pulley shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 1309K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 13xx medium section at 45 mm bore gains rating through a larger 100 mm OD and 25 mm width; verify the housing accepts the larger envelope before substituting for a 1209.",
      "Tapered-bore 1309K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1309K self-aligning ball bearing?",
        "a": "A 1309K self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1309."
      },
      {
        "q": "How does the 1309 bore code work?",
        "a": "The last two digits of 1309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1309K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1309. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 13xx is the medium section: 100×25 mm, 27.5 mm radial section at 45 mm bore, carrying more load than a 1209 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1309K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2309",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "seal_type": "open",
    "dynamic_load_kN": 55,
    "static_load_kN": 16.7,
    "fatigue_load_limit_kN": 0.71,
    "limiting_speed_rpm": 5600,
    "speed_oil_rpm": 7100,
    "weight_g": 1200,
    "manufacturer_designation": "2309S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2309S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 36 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor roller and pulley shafts",
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2309; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 45 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2309 has no lubricant retention: grease escapes and contaminants migrate straight into the 45×100×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2309 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 36 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2309 self-aligning ball bearing?",
        "a": "A 2309 self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2309 bore code work?",
        "a": "The last two digits of 2309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2309?",
        "a": "A bare 2309 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 23xx is the wide heavy section: 100×36 mm, 27.5 mm radial section at 45 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2309-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2309-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2309-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2309-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2309K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "seal_type": "open",
    "dynamic_load_kN": 55,
    "static_load_kN": 16.7,
    "fatigue_load_limit_kN": 0.71,
    "limiting_speed_rpm": 5600,
    "speed_oil_rpm": 7100,
    "weight_g": 1200,
    "manufacturer_designation": "2309SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2309SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2309 carries bore code 09 = 45 mm. Outside diameter 100 mm and width 36 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2309. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "agricultural equipment (harvesters, balers)",
      "industrial fan and blower shafts",
      "electric motors and generators",
      "centrifugal pump shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 2309K; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.",
      "The 23xx heavy wide-section at 45 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2309K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 45 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2309K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2309K self-aligning ball bearing?",
        "a": "A 2309K self-aligning ball bearing has a 45 mm bore, 100 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2309."
      },
      {
        "q": "How does the 2309 bore code work?",
        "a": "The last two digits of 2309 are bore code 09, giving 09 × 5 = 45 mm bore. The 100 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2309K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2309. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 45 mm bore?",
        "a": "The 23xx is the wide heavy section: 100×36 mm, 27.5 mm radial section at 45 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2309K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1210",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 22.8,
    "static_load_kN": 8.1,
    "fatigue_load_limit_kN": 0.33,
    "limiting_speed_rpm": 6300,
    "speed_oil_rpm": 8000,
    "weight_g": 535,
    "manufacturer_designation": "1210S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1210S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1210 with C3 for those conditions.",
      "The 12xx light section at 50 mm bore uses a smaller 90 mm OD than a 1310; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1210 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1210-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1210 self-aligning ball bearing?",
        "a": "A 1210 self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1210 bore code work?",
        "a": "The last two digits of 1210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1210?",
        "a": "A bare 1210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 12xx is the light section: 90×20 mm with a 20.0 mm radial section at 50 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1210-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1210-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1210K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 22.8,
    "static_load_kN": 8.1,
    "fatigue_load_limit_kN": 0.33,
    "limiting_speed_rpm": 6300,
    "speed_oil_rpm": 8000,
    "weight_g": 535,
    "manufacturer_designation": "1210SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1210SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 20 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1210. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1210 with C3 for those conditions.",
      "The 12xx light section at 50 mm bore uses a smaller 90 mm OD than a 1310; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1210K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1210K self-aligning ball bearing?",
        "a": "A 1210K self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 20 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1210."
      },
      {
        "q": "How does the 1210 bore code work?",
        "a": "The last two digits of 1210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1210K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1210. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 12xx is the light section: 90×20 mm with a 20.0 mm radial section at 50 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1210K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2210",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 23.3,
    "static_load_kN": 8.45,
    "fatigue_load_limit_kN": 0.57,
    "limiting_speed_rpm": 6300,
    "speed_oil_rpm": 8000,
    "weight_g": 598,
    "manufacturer_designation": "2210S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2210S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2210 with C3 for those conditions.",
      "The 22xx wide-section at 50 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1210.",
      "The open 2210 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×90×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2210 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2210 self-aligning ball bearing?",
        "a": "A 2210 self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2210 bore code work?",
        "a": "The last two digits of 2210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2210?",
        "a": "A bare 2210 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 22xx is the wide light section: 90×23 mm with a 20.0 mm radial section at 50 mm bore, wider than a 1210 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2210-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2210-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2210-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2210-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2210K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 23.3,
    "static_load_kN": 8.45,
    "fatigue_load_limit_kN": 0.57,
    "limiting_speed_rpm": 6300,
    "speed_oil_rpm": 8000,
    "weight_g": 598,
    "manufacturer_designation": "2210SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2210SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2210 carries bore code 10 = 50 mm. Outside diameter 90 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2210. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2210 with C3 for those conditions.",
      "The 22xx wide-section at 50 mm bore adds load capacity through increased 23 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1210.",
      "Tapered-bore 2210K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2210K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2210K self-aligning ball bearing?",
        "a": "A 2210K self-aligning ball bearing has a 50 mm bore, 90 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2210."
      },
      {
        "q": "How does the 2210 bore code work?",
        "a": "The last two digits of 2210 are bore code 10, giving 10 × 5 = 50 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2210K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2210. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 22xx is the wide light section: 90×23 mm with a 20.0 mm radial section at 50 mm bore, wider than a 1210 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2210K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1310",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "seal_type": "open",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 14.1,
    "fatigue_load_limit_kN": 0.35,
    "limiting_speed_rpm": 5600,
    "speed_oil_rpm": 6700,
    "weight_g": 1230,
    "manufacturer_designation": "1310S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1310S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1310 with C3 for those conditions.",
      "The 13xx medium section at 50 mm bore gains rating through a larger 110 mm OD and 27 mm width; verify the housing accepts the larger envelope before substituting for a 1210.",
      "The open 1310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×27 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1310 units.",
      "A 50 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1310 self-aligning ball bearing?",
        "a": "A 1310 self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1310 bore code work?",
        "a": "The last two digits of 1310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1310?",
        "a": "A bare 1310 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 13xx is the medium section: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 1210 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1310-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1310-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1310K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "seal_type": "open",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 14.1,
    "fatigue_load_limit_kN": 0.35,
    "limiting_speed_rpm": 5600,
    "speed_oil_rpm": 6700,
    "weight_g": 1230,
    "manufacturer_designation": "1310SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1310SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 27 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1310. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1310 with C3 for those conditions.",
      "The 13xx medium section at 50 mm bore gains rating through a larger 110 mm OD and 27 mm width; verify the housing accepts the larger envelope before substituting for a 1210.",
      "Tapered-bore 1310K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1310K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1310K self-aligning ball bearing?",
        "a": "A 1310K self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 27 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1310."
      },
      {
        "q": "How does the 1310 bore code work?",
        "a": "The last two digits of 1310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1310K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1310. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 13xx is the medium section: 110×27 mm, 30.0 mm radial section at 50 mm bore, carrying more load than a 1210 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1310K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2310",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "seal_type": "open",
    "dynamic_load_kN": 65,
    "static_load_kN": 20.2,
    "fatigue_load_limit_kN": 0.86,
    "limiting_speed_rpm": 5000,
    "speed_oil_rpm": 6300,
    "weight_g": 1630,
    "manufacturer_designation": "2310S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2310S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 40 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2310 with C3 for those conditions.",
      "The 23xx heavy wide-section at 50 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2310 has no lubricant retention: grease escapes and contaminants migrate straight into the 50×110×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2310 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2310."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2310 self-aligning ball bearing?",
        "a": "A 2310 self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2310 bore code work?",
        "a": "The last two digits of 2310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2310?",
        "a": "A bare 2310 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 23xx is the wide heavy section: 110×40 mm, 30.0 mm radial section at 50 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2310-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2310-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2310-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2310K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "seal_type": "open",
    "dynamic_load_kN": 65,
    "static_load_kN": 20.2,
    "fatigue_load_limit_kN": 0.86,
    "limiting_speed_rpm": 5000,
    "speed_oil_rpm": 6300,
    "weight_g": 1630,
    "manufacturer_designation": "2310SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2310SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2310 carries bore code 10 = 50 mm. Outside diameter 110 mm and width 40 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2310. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 50 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2310 with C3 for those conditions.",
      "The 23xx heavy wide-section at 50 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2310K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 50 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2310K self-aligning ball bearing?",
        "a": "A 2310K self-aligning ball bearing has a 50 mm bore, 110 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2310."
      },
      {
        "q": "How does the 2310 bore code work?",
        "a": "The last two digits of 2310 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2310K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2310. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 50 mm bore?",
        "a": "The 23xx is the wide heavy section: 110×40 mm, 30.0 mm radial section at 50 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2310K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1211",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "seal_type": "open",
    "dynamic_load_kN": 26.9,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 6000,
    "speed_oil_rpm": 7100,
    "weight_g": 708,
    "manufacturer_designation": "1211S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1211S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1211 with C3 for those conditions.",
      "The 12xx light section at 55 mm bore uses a smaller 100 mm OD than a 1311; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×21 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1211 units.",
      "A 55 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1211 self-aligning ball bearing?",
        "a": "A 1211 self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1211 bore code work?",
        "a": "The last two digits of 1211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1211?",
        "a": "A bare 1211 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 12xx is the light section: 100×21 mm with a 22.5 mm radial section at 55 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1211-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1211-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1211K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "seal_type": "open",
    "dynamic_load_kN": 26.9,
    "static_load_kN": 10,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 6000,
    "speed_oil_rpm": 7100,
    "weight_g": 708,
    "manufacturer_designation": "1211SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1211SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 21 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1211. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1211 with C3 for those conditions.",
      "The 12xx light section at 55 mm bore uses a smaller 100 mm OD than a 1311; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1211K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1211K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1211K self-aligning ball bearing?",
        "a": "A 1211K self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 21 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1211."
      },
      {
        "q": "How does the 1211 bore code work?",
        "a": "The last two digits of 1211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 21 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1211K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1211. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 12xx is the light section: 100×21 mm with a 22.5 mm radial section at 55 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1211K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2211",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 26.7,
    "static_load_kN": 9.9,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 6000,
    "speed_oil_rpm": 7100,
    "weight_g": 807,
    "manufacturer_designation": "2211S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2211S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2211 with C3 for those conditions.",
      "The 22xx wide-section at 55 mm bore adds load capacity through increased 25 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1211.",
      "The open 2211 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×100×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2211 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2211."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2211 self-aligning ball bearing?",
        "a": "A 2211 self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2211 bore code work?",
        "a": "The last two digits of 2211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2211?",
        "a": "A bare 2211 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 22xx is the wide light section: 100×25 mm with a 22.5 mm radial section at 55 mm bore, wider than a 1211 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2211-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2211-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2211-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2211-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2211K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 26.7,
    "static_load_kN": 9.9,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 6000,
    "speed_oil_rpm": 7100,
    "weight_g": 807,
    "manufacturer_designation": "2211SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2211SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2211 carries bore code 11 = 55 mm. Outside diameter 100 mm and width 25 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2211. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2211 with C3 for those conditions.",
      "The 22xx wide-section at 55 mm bore adds load capacity through increased 25 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1211.",
      "Tapered-bore 2211K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2211K self-aligning ball bearing?",
        "a": "A 2211K self-aligning ball bearing has a 55 mm bore, 100 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2211."
      },
      {
        "q": "How does the 2211 bore code work?",
        "a": "The last two digits of 2211 are bore code 11, giving 11 × 5 = 55 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2211K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2211. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 22xx is the wide light section: 100×25 mm with a 22.5 mm radial section at 55 mm bore, wider than a 1211 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2211K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1311",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "seal_type": "open",
    "dynamic_load_kN": 51.5,
    "static_load_kN": 17.9,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 5000,
    "speed_oil_rpm": 6300,
    "weight_g": 1600,
    "manufacturer_designation": "1311S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1311S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1311 with C3 for those conditions.",
      "The 13xx medium section at 55 mm bore gains rating through a larger 120 mm OD and 29 mm width; verify the housing accepts the larger envelope before substituting for a 1211.",
      "The open 1311 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×29 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1311 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1311 self-aligning ball bearing?",
        "a": "A 1311 self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1311 bore code work?",
        "a": "The last two digits of 1311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1311?",
        "a": "A bare 1311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 13xx is the medium section: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 1211 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1311-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1311-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1311K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "seal_type": "open",
    "dynamic_load_kN": 51.5,
    "static_load_kN": 17.9,
    "fatigue_load_limit_kN": 0.4,
    "limiting_speed_rpm": 5000,
    "speed_oil_rpm": 6300,
    "weight_g": 1600,
    "manufacturer_designation": "1311SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1311SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 29 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1311. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1311 with C3 for those conditions.",
      "The 13xx medium section at 55 mm bore gains rating through a larger 120 mm OD and 29 mm width; verify the housing accepts the larger envelope before substituting for a 1211.",
      "Tapered-bore 1311K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1311K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1311K self-aligning ball bearing?",
        "a": "A 1311K self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 29 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1311."
      },
      {
        "q": "How does the 1311 bore code work?",
        "a": "The last two digits of 1311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1311K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1311. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 13xx is the medium section: 120×29 mm, 32.5 mm radial section at 55 mm bore, carrying more load than a 1211 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1311K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2311",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 1,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 2080,
    "manufacturer_designation": "2311S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2311S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 43 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2311 with C3 for those conditions.",
      "The 23xx heavy wide-section at 55 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2311 has no lubricant retention: grease escapes and contaminants migrate straight into the 55×120×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2311 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2311."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2311 self-aligning ball bearing?",
        "a": "A 2311 self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2311 bore code work?",
        "a": "The last two digits of 2311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2311?",
        "a": "A bare 2311 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 23xx is the wide heavy section: 120×43 mm, 32.5 mm radial section at 55 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2311-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2311K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 1,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 2080,
    "manufacturer_designation": "2311SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2311SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2311 carries bore code 11 = 55 mm. Outside diameter 120 mm and width 43 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2311. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 55 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2311 with C3 for those conditions.",
      "The 23xx heavy wide-section at 55 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2311K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 55 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2311-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2311K self-aligning ball bearing?",
        "a": "A 2311K self-aligning ball bearing has a 55 mm bore, 120 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2311."
      },
      {
        "q": "How does the 2311 bore code work?",
        "a": "The last two digits of 2311 are bore code 11, giving 11 × 5 = 55 mm bore. The 120 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2311K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2311. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 55 mm bore?",
        "a": "The 23xx is the wide heavy section: 120×43 mm, 32.5 mm radial section at 55 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2311K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1212",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "seal_type": "open",
    "dynamic_load_kN": 30.5,
    "static_load_kN": 11.5,
    "fatigue_load_limit_kN": 0.46,
    "limiting_speed_rpm": 5300,
    "speed_oil_rpm": 6300,
    "weight_g": 910,
    "manufacturer_designation": "1212S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1212S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1212 with C3 for those conditions.",
      "The 12xx light section at 60 mm bore uses a smaller 110 mm OD than a 1312; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×22 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1212 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 22 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1212 self-aligning ball bearing?",
        "a": "A 1212 self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1212 bore code work?",
        "a": "The last two digits of 1212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1212?",
        "a": "A bare 1212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 12xx is the light section: 110×22 mm with a 25.0 mm radial section at 60 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1212-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1212-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1212K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "seal_type": "open",
    "dynamic_load_kN": 30.5,
    "static_load_kN": 11.5,
    "fatigue_load_limit_kN": 0.46,
    "limiting_speed_rpm": 5300,
    "speed_oil_rpm": 6300,
    "weight_g": 910,
    "manufacturer_designation": "1212SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1212SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 22 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1212. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1212 with C3 for those conditions.",
      "The 12xx light section at 60 mm bore uses a smaller 110 mm OD than a 1312; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1212K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1212K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1212K self-aligning ball bearing?",
        "a": "A 1212K self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 22 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1212."
      },
      {
        "q": "How does the 1212 bore code work?",
        "a": "The last two digits of 1212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1212K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1212. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 12xx is the light section: 110×22 mm with a 25.0 mm radial section at 60 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1212K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2212",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "seal_type": "open",
    "dynamic_load_kN": 34,
    "static_load_kN": 12.6,
    "fatigue_load_limit_kN": 0.84,
    "limiting_speed_rpm": 5300,
    "speed_oil_rpm": 6300,
    "weight_g": 1100,
    "manufacturer_designation": "2212S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2212S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 28 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2212 with C3 for those conditions.",
      "The 22xx wide-section at 60 mm bore adds load capacity through increased 28 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1212.",
      "The open 2212 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×110×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2212 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2212."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2212 self-aligning ball bearing?",
        "a": "A 2212 self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2212 bore code work?",
        "a": "The last two digits of 2212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2212?",
        "a": "A bare 2212 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 22xx is the wide light section: 110×28 mm with a 25.0 mm radial section at 60 mm bore, wider than a 1212 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2212-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2212-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty."
      },
      {
        "equiv_sku": "2212-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2212-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2212K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "seal_type": "open",
    "dynamic_load_kN": 34,
    "static_load_kN": 12.6,
    "fatigue_load_limit_kN": 0.84,
    "limiting_speed_rpm": 5300,
    "speed_oil_rpm": 6300,
    "weight_g": 1100,
    "manufacturer_designation": "2212SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2212SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2212 carries bore code 12 = 60 mm. Outside diameter 110 mm and width 28 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2212. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2212 with C3 for those conditions.",
      "The 22xx wide-section at 60 mm bore adds load capacity through increased 28 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1212.",
      "Tapered-bore 2212K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2212-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2212K self-aligning ball bearing?",
        "a": "A 2212K self-aligning ball bearing has a 60 mm bore, 110 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2212."
      },
      {
        "q": "How does the 2212 bore code work?",
        "a": "The last two digits of 2212 are bore code 12, giving 12 × 5 = 60 mm bore. The 110 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2212K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2212. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 22xx is the wide light section: 110×28 mm with a 25.0 mm radial section at 60 mm bore, wider than a 1212 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2212K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1312",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.51,
    "limiting_speed_rpm": 4500,
    "speed_oil_rpm": 5600,
    "weight_g": 2000,
    "manufacturer_designation": "1312S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1312S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1312 with C3 for those conditions.",
      "The 13xx medium section at 60 mm bore gains rating through a larger 130 mm OD and 31 mm width; verify the housing accepts the larger envelope before substituting for a 1212.",
      "The open 1312 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1312 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1312."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1312 self-aligning ball bearing?",
        "a": "A 1312 self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1312 bore code work?",
        "a": "The last two digits of 1312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1312?",
        "a": "A bare 1312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 13xx is the medium section: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 1212 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1312-EKTN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1312-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1312K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.51,
    "limiting_speed_rpm": 4500,
    "speed_oil_rpm": 5600,
    "weight_g": 2000,
    "manufacturer_designation": "1312SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1312SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1312. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1312 with C3 for those conditions.",
      "The 13xx medium section at 60 mm bore gains rating through a larger 130 mm OD and 31 mm width; verify the housing accepts the larger envelope before substituting for a 1212.",
      "Tapered-bore 1312K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1312K self-aligning ball bearing?",
        "a": "A 1312K self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1312."
      },
      {
        "q": "How does the 1312 bore code work?",
        "a": "The last two digits of 1312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1312K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1312. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 13xx is the medium section: 130×31 mm, 35.0 mm radial section at 60 mm bore, carrying more load than a 1212 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1312K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2312",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "seal_type": "open",
    "dynamic_load_kN": 88.5,
    "static_load_kN": 28.3,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 2580,
    "manufacturer_designation": "2312S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2312S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 46 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2312 with C3 for those conditions.",
      "The 23xx heavy wide-section at 60 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2312 has no lubricant retention: grease escapes and contaminants migrate straight into the 60×130×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2312 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2312 self-aligning ball bearing?",
        "a": "A 2312 self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2312 bore code work?",
        "a": "The last two digits of 2312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2312?",
        "a": "A bare 2312 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 23xx is the wide heavy section: 130×46 mm, 35.0 mm radial section at 60 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2312-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2312K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "seal_type": "open",
    "dynamic_load_kN": 88.5,
    "static_load_kN": 28.3,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 2580,
    "manufacturer_designation": "2312SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2312SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2312 carries bore code 12 = 60 mm. Outside diameter 130 mm and width 46 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2312. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 60 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2312 with C3 for those conditions.",
      "The 23xx heavy wide-section at 60 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2312K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 60 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 60 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2312K self-aligning ball bearing?",
        "a": "A 2312K self-aligning ball bearing has a 60 mm bore, 130 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2312."
      },
      {
        "q": "How does the 2312 bore code work?",
        "a": "The last two digits of 2312 are bore code 12, giving 12 × 5 = 60 mm bore. The 130 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2312K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2312. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 60 mm bore?",
        "a": "The 23xx is the wide heavy section: 130×46 mm, 35.0 mm radial section at 60 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2312K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1213",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 31,
    "static_load_kN": 12.5,
    "fatigue_load_limit_kN": 0.5,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1160,
    "manufacturer_designation": "1213S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1213S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1213 with C3 for those conditions.",
      "The 12xx light section at 65 mm bore uses a smaller 120 mm OD than a 1313; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×23 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1213 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1213."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1213 self-aligning ball bearing?",
        "a": "A 1213 self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1213 bore code work?",
        "a": "The last two digits of 1213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1213?",
        "a": "A bare 1213 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 12xx is the light section: 120×23 mm with a 27.5 mm radial section at 65 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1213-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1213-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1213K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "seal_type": "open",
    "dynamic_load_kN": 31,
    "static_load_kN": 12.5,
    "fatigue_load_limit_kN": 0.5,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1160,
    "manufacturer_designation": "1213SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1213SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 23 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1213. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1213 with C3 for those conditions.",
      "The 12xx light section at 65 mm bore uses a smaller 120 mm OD than a 1313; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1213K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1213K self-aligning ball bearing?",
        "a": "A 1213K self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 23 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1213."
      },
      {
        "q": "How does the 1213 bore code work?",
        "a": "The last two digits of 1213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 23 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1213K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1213. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 12xx is the light section: 120×23 mm with a 27.5 mm radial section at 65 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1213K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2213",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 16.4,
    "fatigue_load_limit_kN": 0.92,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1500,
    "manufacturer_designation": "2213S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2213S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2213 with C3 for those conditions.",
      "The 22xx wide-section at 65 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1213.",
      "The open 2213 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×120×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2213 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2213 self-aligning ball bearing?",
        "a": "A 2213 self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2213 bore code work?",
        "a": "The last two digits of 2213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2213?",
        "a": "A bare 2213 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 22xx is the wide light section: 120×31 mm with a 27.5 mm radial section at 65 mm bore, wider than a 1213 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2213-E-2RS1KTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2213-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      },
      {
        "equiv_sku": "2213-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2213-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2213K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 43.5,
    "static_load_kN": 16.4,
    "fatigue_load_limit_kN": 0.92,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1500,
    "manufacturer_designation": "2213SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2213SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2213 carries bore code 13 = 65 mm. Outside diameter 120 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2213. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2213 with C3 for those conditions.",
      "The 22xx wide-section at 65 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1213.",
      "Tapered-bore 2213K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 65 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2213K self-aligning ball bearing?",
        "a": "A 2213K self-aligning ball bearing has a 65 mm bore, 120 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2213."
      },
      {
        "q": "How does the 2213 bore code work?",
        "a": "The last two digits of 2213 are bore code 13, giving 13 × 5 = 65 mm bore. The 120 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2213K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2213. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 22xx is the wide light section: 120×31 mm with a 27.5 mm radial section at 65 mm bore, wider than a 1213 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2213K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1313",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "seal_type": "open",
    "dynamic_load_kN": 62.5,
    "static_load_kN": 22.9,
    "fatigue_load_limit_kN": 0.67,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 2470,
    "manufacturer_designation": "1313S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1313S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1313 with C3 for those conditions.",
      "The 13xx medium section at 65 mm bore gains rating through a larger 140 mm OD and 33 mm width; verify the housing accepts the larger envelope before substituting for a 1213.",
      "The open 1313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1313 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1313."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1313 self-aligning ball bearing?",
        "a": "A 1313 self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1313 bore code work?",
        "a": "The last two digits of 1313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1313?",
        "a": "A bare 1313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 13xx is the medium section: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 1213 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1313-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "1313-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "1313K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "seal_type": "open",
    "dynamic_load_kN": 62.5,
    "static_load_kN": 22.9,
    "fatigue_load_limit_kN": 0.67,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 2470,
    "manufacturer_designation": "1313SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1313SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1313. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1313 with C3 for those conditions.",
      "The 13xx medium section at 65 mm bore gains rating through a larger 140 mm OD and 33 mm width; verify the housing accepts the larger envelope before substituting for a 1213.",
      "Tapered-bore 1313K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1313-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1313K self-aligning ball bearing?",
        "a": "A 1313K self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1313."
      },
      {
        "q": "How does the 1313 bore code work?",
        "a": "The last two digits of 1313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1313K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1313. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 13xx is the medium section: 140×33 mm, 37.5 mm radial section at 65 mm bore, carrying more load than a 1213 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1313K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2313",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "seal_type": "open",
    "dynamic_load_kN": 97,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.4,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4800,
    "weight_g": 3200,
    "manufacturer_designation": "2313S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2313S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 48 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2313 with C3 for those conditions.",
      "The 23xx heavy wide-section at 65 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2313 has no lubricant retention: grease escapes and contaminants migrate straight into the 65×140×48 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2313 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2313-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2313 self-aligning ball bearing?",
        "a": "A 2313 self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 48 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2313 bore code work?",
        "a": "The last two digits of 2313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2313?",
        "a": "A bare 2313 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 23xx is the wide heavy section: 140×48 mm, 37.5 mm radial section at 65 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2313-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2313K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "seal_type": "open",
    "dynamic_load_kN": 97,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.4,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4800,
    "weight_g": 3200,
    "manufacturer_designation": "2313SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2313SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2313 carries bore code 13 = 65 mm. Outside diameter 140 mm and width 48 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2313. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 65 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2313 with C3 for those conditions.",
      "The 23xx heavy wide-section at 65 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2313K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 65 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 48 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2313K self-aligning ball bearing?",
        "a": "A 2313K self-aligning ball bearing has a 65 mm bore, 140 mm outer diameter and 48 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2313."
      },
      {
        "q": "How does the 2313 bore code work?",
        "a": "The last two digits of 2313 are bore code 13, giving 13 × 5 = 65 mm bore. The 140 mm outside diameter and 48 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2313K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2313. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 65 mm bore?",
        "a": "The 23xx is the wide heavy section: 140×48 mm, 37.5 mm radial section at 65 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2313K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1214",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "seal_type": "open",
    "dynamic_load_kN": 35,
    "static_load_kN": 13.8,
    "fatigue_load_limit_kN": 0.55,
    "limiting_speed_rpm": 4800,
    "speed_oil_rpm": 5600,
    "weight_g": 1300,
    "manufacturer_designation": "1214S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1214S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 24 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1214 with C3 for those conditions.",
      "The 12xx light section at 70 mm bore uses a smaller 125 mm OD than a 1314; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×24 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1214 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1214."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1214 self-aligning ball bearing?",
        "a": "A 1214 self-aligning ball bearing has a 70 mm bore, 125 mm outer diameter and 24 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1214 bore code work?",
        "a": "The last two digits of 1214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 24 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1214?",
        "a": "A bare 1214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 70 mm bore?",
        "a": "The 12xx is the light section: 125×24 mm with a 27.5 mm radial section at 70 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1214-ETN9",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2214",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 44,
    "static_load_kN": 17.1,
    "fatigue_load_limit_kN": 1.1,
    "limiting_speed_rpm": 4500,
    "speed_oil_rpm": 5600,
    "weight_g": 1550,
    "manufacturer_designation": "2214S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2214S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2214 carries bore code 14 = 70 mm. Outside diameter 125 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2214 with C3 for those conditions.",
      "The 22xx wide-section at 70 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1214.",
      "The open 2214 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×125×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2214 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2214-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2214 self-aligning ball bearing?",
        "a": "A 2214 self-aligning ball bearing has a 70 mm bore, 125 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2214 bore code work?",
        "a": "The last two digits of 2214 are bore code 14, giving 14 × 5 = 70 mm bore. The 125 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2214?",
        "a": "A bare 2214 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 70 mm bore?",
        "a": "The 22xx is the wide light section: 125×31 mm with a 27.5 mm radial section at 70 mm bore, wider than a 1214 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2214-E-2RS1TN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×125×31 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      }
    ]
  },
  {
    "sku": "1314",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "seal_type": "open",
    "dynamic_load_kN": 75,
    "static_load_kN": 27.7,
    "fatigue_load_limit_kN": 0.69,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 3030,
    "manufacturer_designation": "1314S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1314S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 35 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1314 with C3 for those conditions.",
      "The 13xx medium section at 70 mm bore gains rating through a larger 150 mm OD and 35 mm width; verify the housing accepts the larger envelope before substituting for a 1214.",
      "The open 1314 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×35 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1314 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1314 self-aligning ball bearing?",
        "a": "A 1314 self-aligning ball bearing has a 70 mm bore, 150 mm outer diameter and 35 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1314 bore code work?",
        "a": "The last two digits of 1314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1314?",
        "a": "A bare 1314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 70 mm bore?",
        "a": "The 13xx is the medium section: 150×35 mm, 40.0 mm radial section at 70 mm bore, carrying more load than a 1214 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1314",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2314",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "seal_type": "open",
    "dynamic_load_kN": 111,
    "static_load_kN": 37.5,
    "fatigue_load_limit_kN": 1.6,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4500,
    "weight_g": 3900,
    "manufacturer_designation": "2314S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2314S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2314 carries bore code 14 = 70 mm. Outside diameter 150 mm and width 51 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 70 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2314 with C3 for those conditions.",
      "The 23xx heavy wide-section at 70 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2314 has no lubricant retention: grease escapes and contaminants migrate straight into the 70×150×51 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2314 units.",
      "A 70 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2314 self-aligning ball bearing?",
        "a": "A 2314 self-aligning ball bearing has a 70 mm bore, 150 mm outer diameter and 51 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2314 bore code work?",
        "a": "The last two digits of 2314 are bore code 14, giving 14 × 5 = 70 mm bore. The 150 mm outside diameter and 51 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2314?",
        "a": "A bare 2314 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 70 mm bore?",
        "a": "The 23xx is the wide heavy section: 150×51 mm, 40.0 mm radial section at 70 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2314",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1215",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 39,
    "static_load_kN": 15.7,
    "fatigue_load_limit_kN": 0.63,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1360,
    "manufacturer_designation": "1215S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1215S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1215 with C3 for those conditions.",
      "The 12xx light section at 75 mm bore uses a smaller 130 mm OD than a 1315; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1215 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×25 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1215 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1215 self-aligning ball bearing?",
        "a": "A 1215 self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1215 bore code work?",
        "a": "The last two digits of 1215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1215?",
        "a": "A bare 1215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 12xx is the light section: 130×25 mm with a 27.5 mm radial section at 75 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1215-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1215K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 39,
    "static_load_kN": 15.7,
    "fatigue_load_limit_kN": 0.63,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1360,
    "manufacturer_designation": "1215SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1215SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 25 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1215. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1215 with C3 for those conditions.",
      "The 12xx light section at 75 mm bore uses a smaller 130 mm OD than a 1315; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1215K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1215K self-aligning ball bearing?",
        "a": "A 1215K self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 25 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1215."
      },
      {
        "q": "How does the 1215 bore code work?",
        "a": "The last two digits of 1215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 25 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1215K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1215. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 12xx is the light section: 130×25 mm with a 27.5 mm radial section at 75 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1215K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2215",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 44.5,
    "static_load_kN": 17.8,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1600,
    "manufacturer_designation": "2215S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2215S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2215 with C3 for those conditions.",
      "The 22xx wide-section at 75 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1215.",
      "The open 2215 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×130×31 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2215 units.",
      "A 75 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2215 self-aligning ball bearing?",
        "a": "A 2215 self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2215 bore code work?",
        "a": "The last two digits of 2215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2215?",
        "a": "A bare 2215 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 22xx is the wide light section: 130×31 mm with a 27.5 mm radial section at 75 mm bore, wider than a 1215 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2215-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2215-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2215K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "seal_type": "open",
    "dynamic_load_kN": 44.5,
    "static_load_kN": 17.8,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1600,
    "manufacturer_designation": "2215SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2215SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2215 carries bore code 15 = 75 mm. Outside diameter 130 mm and width 31 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2215. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2215 with C3 for those conditions.",
      "The 22xx wide-section at 75 mm bore adds load capacity through increased 31 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1215.",
      "Tapered-bore 2215K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2215K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2215K self-aligning ball bearing?",
        "a": "A 2215K self-aligning ball bearing has a 75 mm bore, 130 mm outer diameter and 31 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2215."
      },
      {
        "q": "How does the 2215 bore code work?",
        "a": "The last two digits of 2215 are bore code 15, giving 15 × 5 = 75 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2215K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2215. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 22xx is the wide light section: 130×31 mm with a 27.5 mm radial section at 75 mm bore, wider than a 1215 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2215K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1315",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "seal_type": "open",
    "dynamic_load_kN": 80,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4500,
    "weight_g": 3630,
    "manufacturer_designation": "1315S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1315S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1315 with C3 for those conditions.",
      "The 13xx medium section at 75 mm bore gains rating through a larger 160 mm OD and 37 mm width; verify the housing accepts the larger envelope before substituting for a 1215.",
      "The open 1315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×37 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1315 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1315-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1315 self-aligning ball bearing?",
        "a": "A 1315 self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1315 bore code work?",
        "a": "The last two digits of 1315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1315?",
        "a": "A bare 1315 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 13xx is the medium section: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 1215 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1315-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1315K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "seal_type": "open",
    "dynamic_load_kN": 80,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 0.72,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4500,
    "weight_g": 3630,
    "manufacturer_designation": "1315SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1315SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 37 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1315. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial electric motor shafts",
      "pump and compressor drive shafts",
      "gearbox and speed reducer shafts",
      "conveyor and material handling drives"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 1315 with C3 for those conditions.",
      "The 13xx medium section at 75 mm bore gains rating through a larger 160 mm OD and 37 mm width; verify the housing accepts the larger envelope before substituting for a 1215.",
      "Tapered-bore 1315K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 37 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1315K self-aligning ball bearing?",
        "a": "A 1315K self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 37 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1315."
      },
      {
        "q": "How does the 1315 bore code work?",
        "a": "The last two digits of 1315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1315K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1315. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 13xx is the medium section: 160×37 mm, 42.5 mm radial section at 75 mm bore, carrying more load than a 1215 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1315K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2315",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "seal_type": "open",
    "dynamic_load_kN": 125,
    "static_load_kN": 43,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 4780,
    "manufacturer_designation": "2315S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2315S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 55 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "conveyor and material handling drives",
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2315 with C3 for those conditions.",
      "The 23xx heavy wide-section at 75 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2315 has no lubricant retention: grease escapes and contaminants migrate straight into the 75×160×55 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2315 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 55 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2315 self-aligning ball bearing?",
        "a": "A 2315 self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 55 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2315 bore code work?",
        "a": "The last two digits of 2315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2315?",
        "a": "A bare 2315 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 23xx is the wide heavy section: 160×55 mm, 42.5 mm radial section at 75 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2315-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2315K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "seal_type": "open",
    "dynamic_load_kN": 125,
    "static_load_kN": 43,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 4780,
    "manufacturer_designation": "2315SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2315SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2315 carries bore code 15 = 75 mm. Outside diameter 160 mm and width 55 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2315. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "textile and printing machine spindles",
      "paper mill and processing equipment shafts",
      "industrial electric motor shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Temperature rise and interference fits consume internal clearance on this 75 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 2315 with C3 for those conditions.",
      "The 23xx heavy wide-section at 75 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2315K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 75 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2315K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2315K self-aligning ball bearing?",
        "a": "A 2315K self-aligning ball bearing has a 75 mm bore, 160 mm outer diameter and 55 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2315."
      },
      {
        "q": "How does the 2315 bore code work?",
        "a": "The last two digits of 2315 are bore code 15, giving 15 × 5 = 75 mm bore. The 160 mm outside diameter and 55 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2315K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2315. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 75 mm bore?",
        "a": "The 23xx is the wide heavy section: 160×55 mm, 42.5 mm radial section at 75 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2315K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1216",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "seal_type": "open",
    "dynamic_load_kN": 40,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.68,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1680,
    "manufacturer_designation": "1216S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1216S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 80 mm bore uses a smaller 140 mm OD than a 1316; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×26 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1216 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1216-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1216 self-aligning ball bearing?",
        "a": "A 1216 self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1216 bore code work?",
        "a": "The last two digits of 1216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1216?",
        "a": "A bare 1216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 12xx is the light section: 140×26 mm with a 30.0 mm radial section at 80 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1216-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1216K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "seal_type": "open",
    "dynamic_load_kN": 40,
    "static_load_kN": 17,
    "fatigue_load_limit_kN": 0.68,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1680,
    "manufacturer_designation": "1216SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1216SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 26 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1216. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 80 mm bore uses a smaller 140 mm OD than a 1316; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1216K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1216K self-aligning ball bearing?",
        "a": "A 1216K self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 26 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1216."
      },
      {
        "q": "How does the 1216 bore code work?",
        "a": "The last two digits of 1216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 26 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1216K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1216. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 12xx is the light section: 140×26 mm with a 30.0 mm radial section at 80 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1216K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2216",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "seal_type": "open",
    "dynamic_load_kN": 49,
    "static_load_kN": 19.9,
    "fatigue_load_limit_kN": 1.3,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 2020,
    "manufacturer_designation": "2216S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2216S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 80 mm bore adds load capacity through increased 33 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1216.",
      "The open 2216 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×140×33 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2216 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2216 self-aligning ball bearing?",
        "a": "A 2216 self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2216 bore code work?",
        "a": "The last two digits of 2216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2216?",
        "a": "A bare 2216 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 22xx is the wide light section: 140×33 mm with a 30.0 mm radial section at 80 mm bore, wider than a 1216 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2216-EKTN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "2216-ETN9",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ]
  },
  {
    "sku": "2216K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "seal_type": "open",
    "dynamic_load_kN": 49,
    "static_load_kN": 19.9,
    "fatigue_load_limit_kN": 1.3,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 2020,
    "manufacturer_designation": "2216SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2216SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2216 carries bore code 16 = 80 mm. Outside diameter 140 mm and width 33 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2216. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 80 mm bore adds load capacity through increased 33 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1216.",
      "Tapered-bore 2216K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2216K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2216K self-aligning ball bearing?",
        "a": "A 2216K self-aligning ball bearing has a 80 mm bore, 140 mm outer diameter and 33 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2216."
      },
      {
        "q": "How does the 2216 bore code work?",
        "a": "The last two digits of 2216 are bore code 16, giving 16 × 5 = 80 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2216K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2216. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 22xx is the wide light section: 140×33 mm with a 30.0 mm radial section at 80 mm bore, wider than a 1216 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2216K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1316",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "seal_type": "open",
    "dynamic_load_kN": 89,
    "static_load_kN": 33,
    "fatigue_load_limit_kN": 0.8,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4300,
    "weight_g": 4240,
    "manufacturer_designation": "1316S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1316S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 80 mm bore gains rating through a larger 170 mm OD and 39 mm width; verify the housing accepts the larger envelope before substituting for a 1216.",
      "The open 1316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×39 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1316 units.",
      "A 80 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1316 self-aligning ball bearing?",
        "a": "A 1316 self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1316 bore code work?",
        "a": "The last two digits of 1316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1316?",
        "a": "A bare 1316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 13xx is the medium section: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 1216 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1316-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1316K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "seal_type": "open",
    "dynamic_load_kN": 89,
    "static_load_kN": 33,
    "fatigue_load_limit_kN": 0.8,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4300,
    "weight_g": 4240,
    "manufacturer_designation": "1316SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1316SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 39 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1316. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 80 mm bore gains rating through a larger 170 mm OD and 39 mm width; verify the housing accepts the larger envelope before substituting for a 1216.",
      "Tapered-bore 1316K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1316K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1316K self-aligning ball bearing?",
        "a": "A 1316K self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 39 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1316."
      },
      {
        "q": "How does the 1316 bore code work?",
        "a": "The last two digits of 1316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 39 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1316K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1316. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 13xx is the medium section: 170×39 mm, 45.0 mm radial section at 80 mm bore, carrying more load than a 1216 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1316K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2316",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "seal_type": "open",
    "dynamic_load_kN": 130,
    "static_load_kN": 45,
    "fatigue_load_limit_kN": 1.9,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 5630,
    "manufacturer_designation": "2316S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2316S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 58 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 80 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2316 has no lubricant retention: grease escapes and contaminants migrate straight into the 80×170×58 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2316 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2316."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2316 self-aligning ball bearing?",
        "a": "A 2316 self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 58 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2316 bore code work?",
        "a": "The last two digits of 2316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2316?",
        "a": "A bare 2316 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 23xx is the wide heavy section: 170×58 mm, 45.0 mm radial section at 80 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2316-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2316K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "seal_type": "open",
    "dynamic_load_kN": 130,
    "static_load_kN": 45,
    "fatigue_load_limit_kN": 1.9,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 5630,
    "manufacturer_designation": "2316SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2316SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2316 carries bore code 16 = 80 mm. Outside diameter 170 mm and width 58 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2316. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 80 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 80 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2316K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 80 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2316K self-aligning ball bearing?",
        "a": "A 2316K self-aligning ball bearing has a 80 mm bore, 170 mm outer diameter and 58 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2316."
      },
      {
        "q": "How does the 2316 bore code work?",
        "a": "The last two digits of 2316 are bore code 16, giving 16 × 5 = 80 mm bore. The 170 mm outside diameter and 58 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2316K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2316. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 80 mm bore?",
        "a": "The 23xx is the wide heavy section: 170×58 mm, 45.0 mm radial section at 80 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2316K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1217",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "seal_type": "open",
    "dynamic_load_kN": 49.5,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.83,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4500,
    "weight_g": 2100,
    "manufacturer_designation": "1217S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1217S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 85 mm bore uses a smaller 150 mm OD than a 1317; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1217 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×28 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1217 units.",
      "A 85 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1217 self-aligning ball bearing?",
        "a": "A 1217 self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1217 bore code work?",
        "a": "The last two digits of 1217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1217?",
        "a": "A bare 1217 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 12xx is the light section: 150×28 mm with a 32.5 mm radial section at 85 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1217-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1217K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "seal_type": "open",
    "dynamic_load_kN": 49.5,
    "static_load_kN": 20.8,
    "fatigue_load_limit_kN": 0.83,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4500,
    "weight_g": 2100,
    "manufacturer_designation": "1217SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1217SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 28 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1217. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 85 mm bore uses a smaller 150 mm OD than a 1317; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1217K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1217K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1217K self-aligning ball bearing?",
        "a": "A 1217K self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 28 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1217."
      },
      {
        "q": "How does the 1217 bore code work?",
        "a": "The last two digits of 1217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 28 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1217K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1217. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 12xx is the light section: 150×28 mm with a 32.5 mm radial section at 85 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1217K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2217",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "seal_type": "open",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 23.6,
    "fatigue_load_limit_kN": 1.5,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4800,
    "weight_g": 2560,
    "manufacturer_designation": "2217S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2217S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 36 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 85 mm bore adds load capacity through increased 36 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1217.",
      "The open 2217 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×150×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2217 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2217."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2217 self-aligning ball bearing?",
        "a": "A 2217 self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2217 bore code work?",
        "a": "The last two digits of 2217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2217?",
        "a": "A bare 2217 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 22xx is the wide light section: 150×36 mm with a 32.5 mm radial section at 85 mm bore, wider than a 1217 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2217-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2217K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "seal_type": "open",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 23.6,
    "fatigue_load_limit_kN": 1.5,
    "limiting_speed_rpm": 3800,
    "speed_oil_rpm": 4800,
    "weight_g": 2560,
    "manufacturer_designation": "2217SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2217SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2217 carries bore code 17 = 85 mm. Outside diameter 150 mm and width 36 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2217. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 85 mm bore adds load capacity through increased 36 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1217.",
      "Tapered-bore 2217K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2217K self-aligning ball bearing?",
        "a": "A 2217K self-aligning ball bearing has a 85 mm bore, 150 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2217."
      },
      {
        "q": "How does the 2217 bore code work?",
        "a": "The last two digits of 2217 are bore code 17, giving 17 × 5 = 85 mm bore. The 150 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2217K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2217. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 22xx is the wide light section: 150×36 mm with a 32.5 mm radial section at 85 mm bore, wider than a 1217 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2217K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1317",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "seal_type": "open",
    "dynamic_load_kN": 98.5,
    "static_load_kN": 38,
    "fatigue_load_limit_kN": 0.95,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 5030,
    "manufacturer_designation": "1317S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1317S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 85 mm bore gains rating through a larger 180 mm OD and 41 mm width; verify the housing accepts the larger envelope before substituting for a 1217.",
      "The open 1317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×41 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1317 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1317 self-aligning ball bearing?",
        "a": "A 1317 self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1317 bore code work?",
        "a": "The last two digits of 1317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1317?",
        "a": "A bare 1317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 13xx is the medium section: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 1217 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1317-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1317K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "seal_type": "open",
    "dynamic_load_kN": 98.5,
    "static_load_kN": 38,
    "fatigue_load_limit_kN": 0.95,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 5030,
    "manufacturer_designation": "1317SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1317SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 41 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1317. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 85 mm bore gains rating through a larger 180 mm OD and 41 mm width; verify the housing accepts the larger envelope before substituting for a 1217.",
      "Tapered-bore 1317K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1317K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1317K self-aligning ball bearing?",
        "a": "A 1317K self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 41 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1317."
      },
      {
        "q": "How does the 1317 bore code work?",
        "a": "The last two digits of 1317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 41 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1317K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1317. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 13xx is the medium section: 180×41 mm, 47.5 mm radial section at 85 mm bore, carrying more load than a 1217 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1317K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2317",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "seal_type": "open",
    "dynamic_load_kN": 142,
    "static_load_kN": 51.5,
    "fatigue_load_limit_kN": 2.1,
    "limiting_speed_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 6560,
    "manufacturer_designation": "2317S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2317S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 60 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 85 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2317 has no lubricant retention: grease escapes and contaminants migrate straight into the 85×180×60 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2317 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2317."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2317 self-aligning ball bearing?",
        "a": "A 2317 self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 60 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2317 bore code work?",
        "a": "The last two digits of 2317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 60 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2317?",
        "a": "A bare 2317 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 23xx is the wide heavy section: 180×60 mm, 47.5 mm radial section at 85 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2317-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2317-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2317K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "seal_type": "open",
    "dynamic_load_kN": 142,
    "static_load_kN": 51.5,
    "fatigue_load_limit_kN": 2.1,
    "limiting_speed_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 6560,
    "manufacturer_designation": "2317SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2317SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2317 carries bore code 17 = 85 mm. Outside diameter 180 mm and width 60 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2317. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 85 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2317K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 85 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2317-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2317K self-aligning ball bearing?",
        "a": "A 2317K self-aligning ball bearing has a 85 mm bore, 180 mm outer diameter and 60 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2317."
      },
      {
        "q": "How does the 2317 bore code work?",
        "a": "The last two digits of 2317 are bore code 17, giving 17 × 5 = 85 mm bore. The 180 mm outside diameter and 60 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2317K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2317. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 85 mm bore?",
        "a": "The 23xx is the wide heavy section: 180×60 mm, 47.5 mm radial section at 85 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2317K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1218",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "seal_type": "open",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 23.5,
    "fatigue_load_limit_kN": 0.94,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4300,
    "weight_g": 2560,
    "manufacturer_designation": "1218S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1218S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 90 mm bore uses a smaller 160 mm OD than a 1318; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1218 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×30 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1218 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1218 self-aligning ball bearing?",
        "a": "A 1218 self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1218 bore code work?",
        "a": "The last two digits of 1218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1218?",
        "a": "A bare 1218 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 12xx is the light section: 160×30 mm with a 35.0 mm radial section at 90 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1218-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1218K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "seal_type": "open",
    "dynamic_load_kN": 57.5,
    "static_load_kN": 23.5,
    "fatigue_load_limit_kN": 0.94,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4300,
    "weight_g": 2560,
    "manufacturer_designation": "1218SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1218SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 30 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1218. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 90 mm bore uses a smaller 160 mm OD than a 1318; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1218K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1218K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1218K self-aligning ball bearing?",
        "a": "A 1218K self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 30 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1218."
      },
      {
        "q": "How does the 1218 bore code work?",
        "a": "The last two digits of 1218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 30 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1218K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1218. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 12xx is the light section: 160×30 mm with a 35.0 mm radial section at 90 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1218K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2218",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "seal_type": "open",
    "dynamic_load_kN": 70.5,
    "static_load_kN": 28.7,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4300,
    "weight_g": 3220,
    "manufacturer_designation": "2218S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2218S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 40 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 90 mm bore adds load capacity through increased 40 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1218.",
      "The open 2218 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×160×40 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2218 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2218."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2218 self-aligning ball bearing?",
        "a": "A 2218 self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2218 bore code work?",
        "a": "The last two digits of 2218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2218?",
        "a": "A bare 2218 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 22xx is the wide light section: 160×40 mm with a 35.0 mm radial section at 90 mm bore, wider than a 1218 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2218-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2218K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "seal_type": "open",
    "dynamic_load_kN": 70.5,
    "static_load_kN": 28.7,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 3600,
    "speed_oil_rpm": 4300,
    "weight_g": 3220,
    "manufacturer_designation": "2218SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2218SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2218 carries bore code 18 = 90 mm. Outside diameter 160 mm and width 40 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2218. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 90 mm bore adds load capacity through increased 40 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1218.",
      "Tapered-bore 2218K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2218-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2218K self-aligning ball bearing?",
        "a": "A 2218K self-aligning ball bearing has a 90 mm bore, 160 mm outer diameter and 40 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2218."
      },
      {
        "q": "How does the 2218 bore code work?",
        "a": "The last two digits of 2218 are bore code 18, giving 18 × 5 = 90 mm bore. The 160 mm outside diameter and 40 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2218K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2218. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 22xx is the wide light section: 160×40 mm with a 35.0 mm radial section at 90 mm bore, wider than a 1218 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2218K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1318",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 117,
    "static_load_kN": 44.5,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 5830,
    "manufacturer_designation": "1318S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1318S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 90 mm bore gains rating through a larger 190 mm OD and 43 mm width; verify the housing accepts the larger envelope before substituting for a 1218.",
      "The open 1318 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×190×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1318 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1318."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1318 self-aligning ball bearing?",
        "a": "A 1318 self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1318 bore code work?",
        "a": "The last two digits of 1318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1318?",
        "a": "A bare 1318 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 13xx is the medium section: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 1218 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1318-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1318K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 117,
    "static_load_kN": 44.5,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 5830,
    "manufacturer_designation": "1318SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1318SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 43 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1318. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 90 mm bore gains rating through a larger 190 mm OD and 43 mm width; verify the housing accepts the larger envelope before substituting for a 1218.",
      "Tapered-bore 1318K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1318K self-aligning ball bearing?",
        "a": "A 1318K self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1318."
      },
      {
        "q": "How does the 1318 bore code work?",
        "a": "The last two digits of 1318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1318K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1318. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 13xx is the medium section: 190×43 mm, 50.0 mm radial section at 90 mm bore, carrying more load than a 1218 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1318K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2318",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "seal_type": "open",
    "dynamic_load_kN": 154,
    "static_load_kN": 57.5,
    "fatigue_load_limit_kN": 2.4,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 7750,
    "manufacturer_designation": "2318S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2318S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 64 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 90 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2318 has no lubricant retention: grease escapes and contaminants migrate straight into the 90×190×64 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2318 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2318 self-aligning ball bearing?",
        "a": "A 2318 self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 64 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2318 bore code work?",
        "a": "The last two digits of 2318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 64 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2318?",
        "a": "A bare 2318 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 23xx is the wide heavy section: 190×64 mm, 50.0 mm radial section at 90 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2318-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2318K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "seal_type": "open",
    "dynamic_load_kN": 154,
    "static_load_kN": 57.5,
    "fatigue_load_limit_kN": 2.4,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 7750,
    "manufacturer_designation": "2318SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2318SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2318 carries bore code 18 = 90 mm. Outside diameter 190 mm and width 64 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2318. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 90 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 90 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2318K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 90 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 90 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2318K self-aligning ball bearing?",
        "a": "A 2318K self-aligning ball bearing has a 90 mm bore, 190 mm outer diameter and 64 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2318."
      },
      {
        "q": "How does the 2318 bore code work?",
        "a": "The last two digits of 2318 are bore code 18, giving 18 × 5 = 90 mm bore. The 190 mm outside diameter and 64 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2318K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2318. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 90 mm bore?",
        "a": "The 23xx is the wide heavy section: 190×64 mm, 50.0 mm radial section at 90 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2318K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1219",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "seal_type": "open",
    "dynamic_load_kN": 64,
    "static_load_kN": 27.1,
    "fatigue_load_limit_kN": 1.1,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3120,
    "manufacturer_designation": "1219S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1219S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 95 mm bore uses a smaller 170 mm OD than a 1319; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×32 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1219 units.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1219."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1219 self-aligning ball bearing?",
        "a": "A 1219 self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1219 bore code work?",
        "a": "The last two digits of 1219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1219?",
        "a": "A bare 1219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 12xx is the light section: 170×32 mm with a 37.5 mm radial section at 95 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1219-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1219K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "seal_type": "open",
    "dynamic_load_kN": 64,
    "static_load_kN": 27.1,
    "fatigue_load_limit_kN": 1.1,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3120,
    "manufacturer_designation": "1219SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1219SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 32 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1219. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 95 mm bore uses a smaller 170 mm OD than a 1319; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1219K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1219K self-aligning ball bearing?",
        "a": "A 1219K self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 32 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1219."
      },
      {
        "q": "How does the 1219 bore code work?",
        "a": "The last two digits of 1219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 32 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1219K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1219. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 12xx is the light section: 170×32 mm with a 37.5 mm radial section at 95 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1219K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2219",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 84,
    "static_load_kN": 34.5,
    "fatigue_load_limit_kN": 2,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3960,
    "manufacturer_designation": "2219S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2219S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 43 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 95 mm bore adds load capacity through increased 43 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1219.",
      "The open 2219 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×170×43 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2219 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2219 self-aligning ball bearing?",
        "a": "A 2219 self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2219 bore code work?",
        "a": "The last two digits of 2219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2219?",
        "a": "A bare 2219 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 22xx is the wide light section: 170×43 mm with a 37.5 mm radial section at 95 mm bore, wider than a 1219 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2219-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2219K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 84,
    "static_load_kN": 34.5,
    "fatigue_load_limit_kN": 2,
    "limiting_speed_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3960,
    "manufacturer_designation": "2219SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2219SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2219 carries bore code 19 = 95 mm. Outside diameter 170 mm and width 43 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2219. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 95 mm bore adds load capacity through increased 43 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1219.",
      "Tapered-bore 2219K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 95 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2219K self-aligning ball bearing?",
        "a": "A 2219K self-aligning ball bearing has a 95 mm bore, 170 mm outer diameter and 43 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2219."
      },
      {
        "q": "How does the 2219 bore code work?",
        "a": "The last two digits of 2219 are bore code 19, giving 19 × 5 = 95 mm bore. The 170 mm outside diameter and 43 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2219K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2219. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 22xx is the wide light section: 170×43 mm with a 37.5 mm radial section at 95 mm bore, wider than a 1219 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2219K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1319",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "seal_type": "open",
    "dynamic_load_kN": 129,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 1.4,
    "limiting_speed_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 6790,
    "manufacturer_designation": "1319S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1319S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 95 mm bore gains rating through a larger 200 mm OD and 45 mm width; verify the housing accepts the larger envelope before substituting for a 1219.",
      "The open 1319 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×45 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1319 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1319."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1319 self-aligning ball bearing?",
        "a": "A 1319 self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1319 bore code work?",
        "a": "The last two digits of 1319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1319?",
        "a": "A bare 1319 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 13xx is the medium section: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 1219 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1319-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1319K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "seal_type": "open",
    "dynamic_load_kN": 129,
    "static_load_kN": 51,
    "fatigue_load_limit_kN": 1.4,
    "limiting_speed_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 6790,
    "manufacturer_designation": "1319SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1319SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 45 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1319. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 95 mm bore gains rating through a larger 200 mm OD and 45 mm width; verify the housing accepts the larger envelope before substituting for a 1219.",
      "Tapered-bore 1319K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1319-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1319K self-aligning ball bearing?",
        "a": "A 1319K self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 45 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1319."
      },
      {
        "q": "How does the 1319 bore code work?",
        "a": "The last two digits of 1319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 45 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1319K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1319. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 13xx is the medium section: 200×45 mm, 52.5 mm radial section at 95 mm bore, carrying more load than a 1219 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1319K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2319",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "seal_type": "open",
    "dynamic_load_kN": 161,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 2.7,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 8970,
    "manufacturer_designation": "2319S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2319S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 67 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 95 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2319 has no lubricant retention: grease escapes and contaminants migrate straight into the 95×200×67 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2319 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2319-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2319 self-aligning ball bearing?",
        "a": "A 2319 self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 67 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2319 bore code work?",
        "a": "The last two digits of 2319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 67 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2319?",
        "a": "A bare 2319 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 23xx is the wide heavy section: 200×67 mm, 52.5 mm radial section at 95 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2319-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "2319-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2319K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "seal_type": "open",
    "dynamic_load_kN": 161,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 2.7,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 8970,
    "manufacturer_designation": "2319SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2319SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2319 carries bore code 19 = 95 mm. Outside diameter 200 mm and width 67 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2319. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 95 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 95 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2319K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 95 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 67 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2319K self-aligning ball bearing?",
        "a": "A 2319K self-aligning ball bearing has a 95 mm bore, 200 mm outer diameter and 67 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2319."
      },
      {
        "q": "How does the 2319 bore code work?",
        "a": "The last two digits of 2319 are bore code 19, giving 19 × 5 = 95 mm bore. The 200 mm outside diameter and 67 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2319K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2319. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 95 mm bore?",
        "a": "The 23xx is the wide heavy section: 200×67 mm, 52.5 mm radial section at 95 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2319K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1220",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "seal_type": "open",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 29.7,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 3740,
    "manufacturer_designation": "1220S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1220S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 100 mm bore uses a smaller 180 mm OD than a 1320; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1220 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×180×34 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1220 units.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 1220."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1220 self-aligning ball bearing?",
        "a": "A 1220 self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1220 bore code work?",
        "a": "The last two digits of 1220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1220?",
        "a": "A bare 1220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 12xx is the light section: 180×34 mm with a 40.0 mm radial section at 100 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1220-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1220K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "seal_type": "open",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 29.7,
    "fatigue_load_limit_kN": 1.2,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 3740,
    "manufacturer_designation": "1220SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1220SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 34 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1220. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 100 mm bore uses a smaller 180 mm OD than a 1320; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1220K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1220-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1220K self-aligning ball bearing?",
        "a": "A 1220K self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 34 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1220."
      },
      {
        "q": "How does the 1220 bore code work?",
        "a": "The last two digits of 1220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 34 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1220K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1220. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 12xx is the light section: 180×34 mm with a 40.0 mm radial section at 100 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1220K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2220",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "seal_type": "open",
    "dynamic_load_kN": 94.5,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 2.3,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 4710,
    "manufacturer_designation": "2220S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2220S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 46 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 100 mm bore adds load capacity through increased 46 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1220.",
      "The open 2220 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×180×46 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2220 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 2220-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2220 self-aligning ball bearing?",
        "a": "A 2220 self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2220 bore code work?",
        "a": "The last two digits of 2220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2220?",
        "a": "A bare 2220 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 22xx is the wide light section: 180×46 mm with a 40.0 mm radial section at 100 mm bore, wider than a 1220 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2220-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2220K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "seal_type": "open",
    "dynamic_load_kN": 94.5,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 2.3,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 4710,
    "manufacturer_designation": "2220SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2220SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2220 carries bore code 20 = 100 mm. Outside diameter 180 mm and width 46 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2220. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 100 mm bore adds load capacity through increased 46 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1220.",
      "Tapered-bore 2220K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2220K self-aligning ball bearing?",
        "a": "A 2220K self-aligning ball bearing has a 100 mm bore, 180 mm outer diameter and 46 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2220."
      },
      {
        "q": "How does the 2220 bore code work?",
        "a": "The last two digits of 2220 are bore code 20, giving 20 × 5 = 100 mm bore. The 180 mm outside diameter and 46 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2220K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2220. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 22xx is the wide light section: 180×46 mm with a 40.0 mm radial section at 100 mm bore, wider than a 1220 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2220K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1320",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "seal_type": "open",
    "dynamic_load_kN": 140,
    "static_load_kN": 57.5,
    "fatigue_load_limit_kN": 1.6,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 8400,
    "manufacturer_designation": "1320S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1320S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 100 mm bore gains rating through a larger 215 mm OD and 47 mm width; verify the housing accepts the larger envelope before substituting for a 1220.",
      "The open 1320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×47 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1320 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1320 self-aligning ball bearing?",
        "a": "A 1320 self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1320 bore code work?",
        "a": "The last two digits of 1320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1320?",
        "a": "A bare 1320 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 13xx is the medium section: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 1220 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1320-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1320K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "seal_type": "open",
    "dynamic_load_kN": 140,
    "static_load_kN": 57.5,
    "fatigue_load_limit_kN": 1.6,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 8400,
    "manufacturer_designation": "1320SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1320SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 47 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1320. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 100 mm bore gains rating through a larger 215 mm OD and 47 mm width; verify the housing accepts the larger envelope before substituting for a 1220.",
      "Tapered-bore 1320K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1320K self-aligning ball bearing?",
        "a": "A 1320K self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 47 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1320."
      },
      {
        "q": "How does the 1320 bore code work?",
        "a": "The last two digits of 1320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 47 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1320K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1320. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 13xx is the medium section: 215×47 mm, 57.5 mm radial section at 100 mm bore, carrying more load than a 1220 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1320K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2320",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "seal_type": "open",
    "dynamic_load_kN": 187,
    "static_load_kN": 79,
    "fatigue_load_limit_kN": 3.3,
    "limiting_speed_rpm": 2400,
    "speed_oil_rpm": 3200,
    "weight_g": 11500,
    "manufacturer_designation": "2320S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2320S"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 73 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 100 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "The open 2320 has no lubricant retention: grease escapes and contaminants migrate straight into the 100×215×73 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2320 units.",
      "A 100 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2320 self-aligning ball bearing?",
        "a": "A 2320 self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 73 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2320 bore code work?",
        "a": "The last two digits of 2320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 73 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2320?",
        "a": "A bare 2320 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 23xx is the wide heavy section: 215×73 mm, 57.5 mm radial section at 100 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2320-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2320K",
    "brand": "NTN",
    "series": "2300-series",
    "type": "self_aligning_ball",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "seal_type": "open",
    "dynamic_load_kN": 187,
    "static_load_kN": 79,
    "fatigue_load_limit_kN": 3.3,
    "limiting_speed_rpm": 2400,
    "speed_oil_rpm": 3200,
    "weight_g": 11500,
    "manufacturer_designation": "2320SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2320SK"
    ],
    "naming_rule_text": "In the 2300-series (ISO 15 dimension series) the leading digits 23 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2320 carries bore code 20 = 100 mm. Outside diameter 215 mm and width 73 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2320. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 100 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 23xx heavy wide-section at 100 mm bore is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 12/13 there.",
      "Tapered-bore 2320K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 100 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 2320K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2320K self-aligning ball bearing?",
        "a": "A 2320K self-aligning ball bearing has a 100 mm bore, 215 mm outer diameter and 73 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2320."
      },
      {
        "q": "How does the 2320 bore code work?",
        "a": "The last two digits of 2320 are bore code 20, giving 20 × 5 = 100 mm bore. The 215 mm outside diameter and 73 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2320K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2320. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2300 compare with other self-aligning series at the same 100 mm bore?",
        "a": "The 23xx is the wide heavy section: 215×73 mm, 57.5 mm radial section at 100 mm bore — the highest-capacity double-row self-aligning option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2320K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1221",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "seal_type": "open",
    "dynamic_load_kN": 75,
    "static_load_kN": 32.5,
    "fatigue_load_limit_kN": 1.3,
    "limiting_speed_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 4430,
    "manufacturer_designation": "1221S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1221S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 36 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 105 mm bore uses a smaller 190 mm OD than a 1321; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1221 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×36 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1221 units.",
      "Do not use a self-aligning ball bearing where high radial rigidity is required — the sphered outer raceway allows more radial movement than a deep-groove or cylindrical roller bearing."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1221 self-aligning ball bearing?",
        "a": "A 1221 self-aligning ball bearing has a 105 mm bore, 190 mm outer diameter and 36 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1221 bore code work?",
        "a": "The last two digits of 1221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 36 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1221?",
        "a": "A bare 1221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 105 mm bore?",
        "a": "The 12xx is the light section: 190×36 mm with a 42.5 mm radial section at 105 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1221",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2221",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 50,
    "seal_type": "open",
    "dynamic_load_kN": 109,
    "static_load_kN": 45,
    "fatigue_load_limit_kN": 2.6,
    "limiting_speed_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 5730,
    "manufacturer_designation": "2221S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2221S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2221 carries bore code 21 = 105 mm. Outside diameter 190 mm and width 50 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 105 mm bore adds load capacity through increased 50 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1221.",
      "The open 2221 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×190×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2221 units.",
      "A 105 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2221 self-aligning ball bearing?",
        "a": "A 2221 self-aligning ball bearing has a 105 mm bore, 190 mm outer diameter and 50 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2221 bore code work?",
        "a": "The last two digits of 2221 are bore code 21, giving 21 × 5 = 105 mm bore. The 190 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2221?",
        "a": "A bare 2221 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 105 mm bore?",
        "a": "The 22xx is the wide light section: 190×50 mm with a 42.5 mm radial section at 105 mm bore, wider than a 1221 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2221",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1321",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "seal_type": "open",
    "dynamic_load_kN": 154,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 1.8,
    "limiting_speed_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 9580,
    "manufacturer_designation": "1321S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1321S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1321 carries bore code 21 = 105 mm. Outside diameter 225 mm and width 49 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 105 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 105 mm bore gains rating through a larger 225 mm OD and 49 mm width; verify the housing accepts the larger envelope before substituting for a 1221.",
      "The open 1321 has no lubricant retention: grease escapes and contaminants migrate straight into the 105×225×49 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1321 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1321-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1321 self-aligning ball bearing?",
        "a": "A 1321 self-aligning ball bearing has a 105 mm bore, 225 mm outer diameter and 49 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1321 bore code work?",
        "a": "The last two digits of 1321 are bore code 21, giving 21 × 5 = 105 mm bore. The 225 mm outside diameter and 49 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1321?",
        "a": "A bare 1321 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 105 mm bore?",
        "a": "The 13xx is the medium section: 225×49 mm, 60.0 mm radial section at 105 mm bore, carrying more load than a 1221 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1321",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1222",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "seal_type": "open",
    "dynamic_load_kN": 87,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 1.5,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 5210,
    "manufacturer_designation": "1222S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1222S"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "raceway smearing under marginal lubrication at start-up",
      "fretting corrosion on a loose shaft seat"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 110 mm bore uses a smaller 200 mm OD than a 1322; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "The open 1222 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×38 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1222 units.",
      "Suffixes stack in a defined order — clearance follows the bore code, e.g. 1222-C3. No clearance suffix means normal CN clearance."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1222 self-aligning ball bearing?",
        "a": "A 1222 self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1222 bore code work?",
        "a": "The last two digits of 1222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1222?",
        "a": "A bare 1222 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 110 mm bore?",
        "a": "The 12xx is the light section: 200×38 mm with a 45.0 mm radial section at 110 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1222-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1222K",
    "brand": "NTN",
    "series": "1200-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "seal_type": "open",
    "dynamic_load_kN": 87,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 1.5,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 5210,
    "manufacturer_designation": "1222SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1222SK"
    ],
    "naming_rule_text": "In the 1200-series (ISO 15 dimension series) the leading digits 12 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 38 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1222. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "cage wear or fracture from sustained vibration or shock loading",
      "false brinelling from vibration while the shaft is stationary"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 12xx light section at 110 mm bore uses a smaller 200 mm OD than a 1322; load ratings are lower, so do not replace a failed 13-series bearing with a 12-series without re-rating the load.",
      "Tapered-bore 1222K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 110 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Shaft and housing fillets must clear the bearing chamfer so the 38 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1222K self-aligning ball bearing?",
        "a": "A 1222K self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 38 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1222."
      },
      {
        "q": "How does the 1222 bore code work?",
        "a": "The last two digits of 1222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 38 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1222K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1222. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1200 compare with other self-aligning series at the same 110 mm bore?",
        "a": "The 12xx is the light section: 200×38 mm with a 45.0 mm radial section at 110 mm bore — below 13/22/23 in load capacity, for light loads in compact spaces."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1222K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "2222",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "seal_type": "open",
    "dynamic_load_kN": 122,
    "static_load_kN": 51.5,
    "fatigue_load_limit_kN": 2.9,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 6750,
    "manufacturer_designation": "2222S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2222S"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 53 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 110 mm bore adds load capacity through increased 53 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1222.",
      "The open 2222 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×200×53 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 2200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 2222 units.",
      "Shaft and housing fillets must clear the bearing chamfer so the 53 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2222 self-aligning ball bearing?",
        "a": "A 2222 self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 53 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 2222 bore code work?",
        "a": "The last two digits of 2222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 53 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 2222?",
        "a": "A bare 2222 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 110 mm bore?",
        "a": "The 22xx is the wide light section: 200×53 mm with a 45.0 mm radial section at 110 mm bore, wider than a 1222 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2222-K",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "2222K",
    "brand": "NTN",
    "series": "2200-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "seal_type": "open",
    "dynamic_load_kN": 122,
    "static_load_kN": 51.5,
    "fatigue_load_limit_kN": 2.9,
    "limiting_speed_rpm": 2800,
    "speed_oil_rpm": 3400,
    "weight_g": 6750,
    "manufacturer_designation": "2222SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "2222SK"
    ],
    "naming_rule_text": "In the 2200-series (ISO 15 dimension series) the leading digits 22 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 2222 carries bore code 22 = 110 mm. Outside diameter 200 mm and width 53 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 2222. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts",
      "pulp, paper and steel mill machinery",
      "heavy industrial drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle",
      "raceway smearing under marginal lubrication at start-up"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 22xx wide-section at 110 mm bore adds load capacity through increased 53 mm width; the wider ring needs a wider housing seat and may reduce limiting speed versus a 1222.",
      "Tapered-bore 2222K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 110 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "Self-aligning ball bearings have lower axial load capacity than same-size angular-contact or tapered-roller bearings; verify the axial component is within the Y-factor limits for 2222K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 2222K self-aligning ball bearing?",
        "a": "A 2222K self-aligning ball bearing has a 110 mm bore, 200 mm outer diameter and 53 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 2222."
      },
      {
        "q": "How does the 2222 bore code work?",
        "a": "The last two digits of 2222 are bore code 22, giving 22 × 5 = 110 mm bore. The 200 mm outside diameter and 53 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 2222K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 2222. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 2200 compare with other self-aligning series at the same 110 mm bore?",
        "a": "The 22xx is the wide light section: 200×53 mm with a 45.0 mm radial section at 110 mm bore, wider than a 1222 for higher load capacity at the cost of speed."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "2222K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "1322",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "seal_type": "open",
    "dynamic_load_kN": 161,
    "static_load_kN": 72.5,
    "fatigue_load_limit_kN": 2.1,
    "limiting_speed_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 11500,
    "manufacturer_designation": "1322S",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1322S"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm follow the ISO 15 general plan. The cylindrical bore fits directly on a machined shaft seat; a tapered-bore K variant is available for adapter-sleeve mounting. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "heavy industrial drive shafts",
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "fretting corrosion on a loose shaft seat",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 110 mm bore gains rating through a larger 240 mm OD and 50 mm width; verify the housing accepts the larger envelope before substituting for a 1222.",
      "The open 1322 has no lubricant retention: grease escapes and contaminants migrate straight into the 110×240×50 mm raceway, so specify a sealed arrangement for dusty or washdown duty.",
      "Open bearings tolerate the highest speeds in the 1300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 1322 units.",
      "A 110 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1322 self-aligning ball bearing?",
        "a": "A 1322 self-aligning ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width, per ISO 15 boundary dimensions. This is the cylindrical-bore version; a tapered-bore K variant is available for adapter-sleeve mounting."
      },
      {
        "q": "How does the 1322 bore code work?",
        "a": "The last two digits of 1322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the open suffix mean on 1322?",
        "a": "A bare 1322 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 110 mm bore?",
        "a": "The 13xx is the medium section: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 1222 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1322-KM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "1322-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "1322K",
    "brand": "NTN",
    "series": "1300-series",
    "type": "self_aligning_ball",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "seal_type": "open",
    "dynamic_load_kN": 161,
    "static_load_kN": 72.5,
    "fatigue_load_limit_kN": 2.1,
    "limiting_speed_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 11500,
    "manufacturer_designation": "1322SK",
    "standard": "ISO 15",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "1322SK"
    ],
    "naming_rule_text": "In the 1300-series (ISO 15 dimension series) the leading digits 13 mark a double-row self-aligning ball bearing and the last two digits encode the bore: 1322 carries bore code 22 = 110 mm. Outside diameter 240 mm and width 50 mm follow the ISO 15 general plan. The K suffix denotes a 1:12 tapered bore for mounting on an adapter sleeve or tapered shaft seat; the cylindrical-bore equivalent is 1322. Two rows of balls run on a common sphered outer raceway, allowing the inner ring to pivot and compensate for shaft deflection or housing misalignment.",
    "applications": [
      "large gearbox and reducer shafts",
      "industrial fan and blower rotors",
      "hoist, winch and crane drums",
      "heavy conveyor drive shafts"
    ],
    "failure_modes": [
      "contamination wear from dust and dirt ingress through the open arrangement",
      "lubricant starvation when no regreasing interval is maintained",
      "false brinelling from vibration while the shaft is stationary",
      "edge loading and stress concentration from excessive misalignment beyond the allowable angle"
    ],
    "pitfalls": [
      "Mount this 110 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.",
      "The 13xx medium section at 110 mm bore gains rating through a larger 240 mm OD and 50 mm width; verify the housing accepts the larger envelope before substituting for a 1222.",
      "Tapered-bore 1322K requires a matching adapter sleeve (e.g. H2xx for small bores, H3xx for larger); verify the sleeve bore code matches the 110 mm shaft before ordering.",
      "The adapter sleeve adds length and a small radial step; check that the housing bore and shaft shoulder clear the sleeve nut and that the withdrawal nut is accessible for future dismounting.",
      "The self-aligning feature compensates for static misalignment and shaft deflection, not for poor initial alignment — always align shaft and housing as accurately as possible before fitting 1322K."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 1322K self-aligning ball bearing?",
        "a": "A 1322K self-aligning ball bearing has a 110 mm bore, 240 mm outer diameter and 50 mm width, per ISO 15 boundary dimensions. The K suffix indicates a 1:12 tapered bore for adapter-sleeve mounting; the cylindrical-bore version is 1322."
      },
      {
        "q": "How does the 1322 bore code work?",
        "a": "The last two digits of 1322 are bore code 22, giving 22 × 5 = 110 mm bore. The 240 mm outside diameter and 50 mm width follow the ISO 15 diameter series, not the bore code alone."
      },
      {
        "q": "What does the K suffix mean on 1322K?",
        "a": "The K suffix denotes a 1:12 tapered bore for mounting with an adapter sleeve. The cylindrical-bore equivalent is 1322. Adapter sleeves are sold separately and must match the bore code."
      },
      {
        "q": "How does the 1300 compare with other self-aligning series at the same 110 mm bore?",
        "a": "The 13xx is the medium section: 240×50 mm, 65.0 mm radial section at 110 mm bore, carrying more load than a 1222 but needing a larger housing bore."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "1322K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "51410",
    "brand": "NTN",
    "series": "51400-series",
    "type": "thrust_ball",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 43,
    "seal_type": "open",
    "dynamic_load_kN": 159,
    "static_load_kN": 318,
    "fatigue_load_limit_kN": 14.2,
    "limiting_speed_rpm": 1400,
    "speed_oil_rpm": 2000,
    "weight_g": 1970,
    "manufacturer_designation": "51410",
    "standard": "ISO 104",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [],
    "naming_rule_text": "In the 51400-series (ISO 104 dimension series) the leading digits 514 mark a single-direction thrust ball bearing and the last two digits encode the bore: 51410 carries bore code 10 = 50 mm. The ISO 104 boundary dimensions are 50 mm bore, 110 mm outside diameter and 43 mm height. Two flat washers (shaft and housing) and a ball cage assembly allow the bearing to carry pure axial load in one direction while accommodating minor misalignment.",
    "applications": [
      "gearbox axial load management",
      "conveyor drive thrust washers",
      "agricultural equipment spindle thrust",
      "industrial fan axial restraint"
    ],
    "failure_modes": [
      "washer seat fretting from a loose housing or shaft fit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded",
      "cage wear or fracture from sustained vibration or shock loading"
    ],
    "pitfalls": [
      "At a 50 mm bore, check shaft shoulder runout before fitting 51410; a skewed shoulder tilts the shaft washer and concentrates load on a few balls.",
      "The 514xx heavy section at 50 mm bore (110 mm OD) is built for high-load, lower-speed duty; specifying it in a high-rpm application gives excess heat and short grease life — use 511/512 there.",
      "Do not use a thrust ball bearing for combined radial-axial loads — pair it with a radial bearing (deep-groove or spherical roller) for the radial component.",
      "Thrust ball bearings carry axial load only — never apply radial load to 51410; the flat washers will skid and score."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a 51410 thrust ball bearing?",
        "a": "A 51410 thrust ball bearing has a 50 mm bore, 110 mm outside diameter and 43 mm height, per ISO 104 boundary dimensions. It consists of a shaft washer, housing washer and ball cage assembly."
      },
      {
        "q": "How does the 51410 bore code work?",
        "a": "The last two digits of 51410 are bore code 10, giving 10 × 5 = 50 mm bore. The 110 mm outside diameter and 43 mm height follow the ISO 104 dimension series, not the bore code alone."
      },
      {
        "q": "Can a 51410 thrust ball bearing carry radial load?",
        "a": "No. Single-direction thrust ball bearings carry axial load only. Any radial component must be supported by a separate radial bearing (deep-groove, cylindrical roller or spherical roller)."
      },
      {
        "q": "How does the 51400 compare with other thrust series at the same 50 mm bore?",
        "a": "The 514xx is the heavy section: 110×43 mm, 30.0 mm radial section at 50 mm bore — the highest-capacity single-direction thrust option here, aimed at lower-speed, high-load shafts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "51410-SKF",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ]
  },
  {
    "sku": "HK0306FT2",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 3,
    "D_mm": 6.5,
    "B_mm": 6,
    "seal_type": "open",
    "dynamic_load_kN": 0.925,
    "static_load_kN": 0.565,
    "fatigue_load_limit_kN": 0.069,
    "limiting_speed_rpm": 33000,
    "speed_oil_rpm": 50000,
    "weight_g": 1,
    "manufacturer_designation": "HK0306FT2",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0306FT2"
    ],
    "naming_rule_text": "HK0306FT2 is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 3 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 6.5 mm and the width is 6 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Automotive steering-column and pedal-box pivots use this size, where the cup is pressed into a sheet-metal bracket and the shaft sees only slow, heavily loaded oscillation. Never re-grease through a drilled hole in the housing wall without a vent path: pressure builds behind the cup, blows grease past the rollers, and starves the bearing while the housing looks full.",
    "applications": [
      "small appliance gear drives",
      "instrument and meter linkages",
      "model and hobby drive trains",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "At a 3 mm shaft diameter the cup wall of HK0306FT2 is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.",
      "The cage in HK0306FT2 spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 3 mm.",
      "The 6 mm narrow section of HK0306FT2 is the compact option at 3 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 3×6.5 mm envelope.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK0306FT2 needle roller bearing?",
        "a": "A HK0306FT2 drawn-cup needle roller bearing has a 3 mm shaft diameter (Fw, under-roller diameter), 6.5 mm outside diameter and 6 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0306FT2 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0306FT2, Fw = 3 mm, so the shaft must be machined to 3 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0306FT2 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0306FT2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK0306FT2 retained in the housing?",
        "a": "The thin-walled drawn cup of HK0306FT2 is press-fitted into a 6.5 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0306FT2",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0408FT2",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 4,
    "D_mm": 8,
    "B_mm": 8,
    "seal_type": "open",
    "dynamic_load_kN": 1.77,
    "static_load_kN": 1.27,
    "fatigue_load_limit_kN": 0.155,
    "limiting_speed_rpm": 30000,
    "speed_oil_rpm": 45000,
    "weight_g": 2,
    "manufacturer_designation": "HK0408FT2",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0408FT2"
    ],
    "naming_rule_text": "NTN HK0408FT2 belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 4 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 8 mm outside and 8 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.",
    "applications": [
      "small appliance gear drives",
      "instrument and meter linkages",
      "model and hobby drive trains",
      "reciprocating or oscillating motion where the rollers never complete a full revolution"
    ],
    "failure_modes": [
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed"
    ],
    "pitfalls": [
      "At a 4 mm shaft diameter the cup wall of HK0408FT2 is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.",
      "The cage in HK0408FT2 spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 4 mm.",
      "The 8 mm narrow section of HK0408FT2 is the compact option at 4 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 4×8 mm envelope.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK0408FT2 needle roller bearing?",
        "a": "A HK0408FT2 drawn-cup needle roller bearing has a 4 mm shaft diameter (Fw, under-roller diameter), 8 mm outside diameter and 8 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0408FT2 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0408FT2, Fw = 4 mm, so the shaft must be machined to 4 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0408FT2 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0408FT2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK0408FT2 retained in the housing?",
        "a": "The thin-walled drawn cup of HK0408FT2 is press-fitted into a 8 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0408FT2",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0509FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 5,
    "D_mm": 9,
    "B_mm": 9,
    "seal_type": "open",
    "dynamic_load_kN": 2.45,
    "static_load_kN": 1.99,
    "fatigue_load_limit_kN": 0.243,
    "limiting_speed_rpm": 27000,
    "speed_oil_rpm": 40000,
    "weight_g": 2,
    "manufacturer_designation": "HK0509FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0509FM"
    ],
    "naming_rule_text": "HK0509FM is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 5 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 9 mm and the width is 9 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.",
    "applications": [
      "office machine and printer mechanisms",
      "small appliance gear drives",
      "instrument and meter linkages",
      "heavily loaded slow pivots where static rating, not dynamic life, governs the choice"
    ],
    "failure_modes": [
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path"
    ],
    "pitfalls": [
      "At a 5 mm shaft diameter the cup wall of HK0509FM is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.",
      "The cage in HK0509FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 5 mm.",
      "The 9 mm narrow section of HK0509FM is the compact option at 5 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 5×9 mm envelope.",
      "HK0509FM runs directly on the shaft: the 5 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK0509FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK0509FM needle roller bearing?",
        "a": "A HK0509FM drawn-cup needle roller bearing has a 5 mm shaft diameter (Fw, under-roller diameter), 9 mm outside diameter and 9 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0509FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0509FM, Fw = 5 mm, so the shaft must be machined to 5 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0509FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0509FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK0509FM retained in the housing?",
        "a": "The thin-walled drawn cup of HK0509FM is press-fitted into a 9 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What duty conditions suit a HK0509FM drawn-cup bearing?",
        "a": "HK0509FM is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (27000/40000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0509FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0609FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 6,
    "D_mm": 10,
    "B_mm": 9,
    "seal_type": "open",
    "dynamic_load_kN": 2.92,
    "static_load_kN": 2.59,
    "fatigue_load_limit_kN": 0.315,
    "limiting_speed_rpm": 25000,
    "speed_oil_rpm": 37000,
    "weight_g": 2,
    "manufacturer_designation": "HK0609FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0609FM"
    ],
    "naming_rule_text": "HK0609FM is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 6 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 10 mm and the width is 9 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. At this miniature shaft size the cup wall is fractions of a millimetre thick, so handling cleanliness and housing-bore accuracy matter more than the paper load rating. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.",
    "applications": [
      "micro gearbox and servo output shafts",
      "office machine and printer mechanisms",
      "small appliance gear drives",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "At a 6 mm shaft diameter the cup wall of HK0609FM is extremely thin; inspect for transportation dents before pressing in, and deburr the housing bore edge or the cup will score and split on entry.",
      "The cage in HK0609FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 6 mm.",
      "The 9 mm narrow section of HK0609FM is the compact option at 6 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 6×10 mm envelope.",
      "The HK0609FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK0609FM needle roller bearing?",
        "a": "A HK0609FM drawn-cup needle roller bearing has a 6 mm shaft diameter (Fw, under-roller diameter), 10 mm outside diameter and 9 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0609FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0609FM, Fw = 6 mm, so the shaft must be machined to 6 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0609FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0609FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK0609FM retained in the housing?",
        "a": "The thin-walled drawn cup of HK0609FM is press-fitted into a 10 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0609FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0709FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 7,
    "D_mm": 11,
    "B_mm": 9,
    "seal_type": "open",
    "dynamic_load_kN": 3.15,
    "static_load_kN": 2.93,
    "fatigue_load_limit_kN": 0.355,
    "limiting_speed_rpm": 23000,
    "speed_oil_rpm": 34000,
    "weight_g": 2,
    "manufacturer_designation": "HK0709FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0709FM"
    ],
    "naming_rule_text": "NTN HK0709FM belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 7 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 11 mm outside and 9 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this size range the drawn cup gives a far smaller radial section than any machined-ring needle bearing of the same shaft, which is why it dominates in compact transmissions. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.",
    "applications": [
      "automotive accessory drives",
      "lawn and garden equipment spindles",
      "motorcycle and scooter transmissions",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "At a 7 mm shaft diameter, shaft surface finish is critical for HK0709FM: grinding marks, corrosion pits or chrome flaking on the journal will fluke the rollers within hours — polish or replace a suspect shaft.",
      "The cage in HK0709FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 7 mm.",
      "The 9 mm narrow section of HK0709FM is the compact option at 7 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 7×11 mm envelope.",
      "The open ends of HK0709FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK0709FM needle roller bearing?",
        "a": "A HK0709FM drawn-cup needle roller bearing has a 7 mm shaft diameter (Fw, under-roller diameter), 11 mm outside diameter and 9 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0709FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0709FM, Fw = 7 mm, so the shaft must be machined to 7 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0709FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0709FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK0709FM retained in the housing?",
        "a": "The thin-walled drawn cup of HK0709FM is press-fitted into a 11 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0709FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0810FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 8,
    "D_mm": 12,
    "B_mm": 10,
    "seal_type": "open",
    "dynamic_load_kN": 3.85,
    "static_load_kN": 3.95,
    "fatigue_load_limit_kN": 0.48,
    "limiting_speed_rpm": 20000,
    "speed_oil_rpm": 30000,
    "weight_g": 3,
    "manufacturer_designation": "HK0810FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0810FM",
      "HK0810FM+IR5x8x12"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK0810FM is built around a thin hardened steel cup.Its printed envelope — 8 mm under-roller diameter, 12 mm outside diameter, 10 mm width — is fixed by ISO 3245; the 8 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this size range the drawn cup gives a far smaller radial section than any machined-ring needle bearing of the same shaft, which is why it dominates in compact transmissions. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.",
    "applications": [
      "lawn and garden equipment spindles",
      "motorcycle and scooter transmissions",
      "two-stroke engine crank and piston pins",
      "compact linkages where the cup doubles as both bearing and structural spacer"
    ],
    "failure_modes": [
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection"
    ],
    "pitfalls": [
      "Needle rollers tolerate almost no misalignment; if the 12 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "At a 8 mm shaft diameter, shaft surface finish is critical for HK0810FM: grinding marks, corrosion pits or chrome flaking on the journal will fluke the rollers within hours — polish or replace a suspect shaft.",
      "The cage in HK0810FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 8 mm.",
      "The 10 mm narrow section of HK0810FM is the compact option at 8 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 8×12 mm envelope."
    ],
    "faq": [
      {
        "q": "Does HK0810FM need a hardened shaft?",
        "a": "Either the 8 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR5x8x12) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK0810FM drawn-cup bearing?",
        "a": "HK0810FM is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (20000/30000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK0810FM needle roller bearing?",
        "a": "A HK0810FM drawn-cup needle roller bearing has a 8 mm shaft diameter (Fw, under-roller diameter), 12 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0810FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0810FM, Fw = 8 mm, so the shaft must be machined to 8 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0810FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0810FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0810FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0910FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 9,
    "D_mm": 13,
    "B_mm": 10,
    "seal_type": "open",
    "dynamic_load_kN": 4.3,
    "static_load_kN": 4.65,
    "fatigue_load_limit_kN": 0.57,
    "limiting_speed_rpm": 18000,
    "speed_oil_rpm": 27000,
    "weight_g": 4,
    "manufacturer_designation": "HK0910FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0910FM",
      "HK0910FM+IR6x9x12"
    ],
    "naming_rule_text": "HK0910FM is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 9 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 13 mm and the width is 10 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this size range the drawn cup gives a far smaller radial section than any machined-ring needle bearing of the same shaft, which is why it dominates in compact transmissions. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.",
    "applications": [
      "small hydraulic pump drives",
      "automotive accessory drives",
      "lawn and garden equipment spindles",
      "compact linkages where the cup doubles as both bearing and structural spacer"
    ],
    "failure_modes": [
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection"
    ],
    "pitfalls": [
      "At a 9 mm shaft diameter, shaft surface finish is critical for HK0910FM: grinding marks, corrosion pits or chrome flaking on the journal will fluke the rollers within hours — polish or replace a suspect shaft.",
      "The cage in HK0910FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 9 mm.",
      "The 10 mm narrow section of HK0910FM is the compact option at 9 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 9×13 mm envelope.",
      "Drawn-cup needle bearings carry radial load only: HK0910FM provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.",
      "The HK0910FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK0910FM needle roller bearing?",
        "a": "A HK0910FM drawn-cup needle roller bearing has a 9 mm shaft diameter (Fw, under-roller diameter), 13 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0910FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0910FM, Fw = 9 mm, so the shaft must be machined to 9 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0910FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0910FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK0910FM need a hardened shaft?",
        "a": "Either the 9 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR6x9x12) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK0910FM drawn-cup bearing?",
        "a": "HK0910FM is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (18000/27000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0910FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK0912F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 9,
    "D_mm": 13,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 5.4,
    "static_load_kN": 6.25,
    "fatigue_load_limit_kN": 0.765,
    "limiting_speed_rpm": 18000,
    "speed_oil_rpm": 27000,
    "weight_g": 4,
    "manufacturer_designation": "HK0912F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK0912F",
      "HK0912F+IR6x9x12"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK0912F is built around a thin hardened steel cup.Its printed envelope — 9 mm under-roller diameter, 13 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 9 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "power tool gear reduction stages",
      "small hydraulic pump drives",
      "automotive accessory drives",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "The open ends of HK0912F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "With no inner ring, HK0912F reads the 9 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK0912F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 9 mm.",
      "The 12 mm standard width of HK0912F is the general-purpose section at 9 mm shaft; wider HK variants in the same 9×13 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "HK0912F runs directly on the shaft: the 9 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead."
    ],
    "faq": [
      {
        "q": "What duty conditions suit a HK0912F drawn-cup bearing?",
        "a": "HK0912F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (18000/27000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK0912F needle roller bearing?",
        "a": "A HK0912F drawn-cup needle roller bearing has a 9 mm shaft diameter (Fw, under-roller diameter), 13 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK0912F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK0912F, Fw = 9 mm, so the shaft must be machined to 9 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK0912F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK0912F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK0912F need a hardened shaft?",
        "a": "Either the 9 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR6x9x12) so a standard unhardened shaft can be used."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK0912F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1010FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 10,
    "D_mm": 14,
    "B_mm": 10,
    "seal_type": "open",
    "dynamic_load_kN": 4.5,
    "static_load_kN": 5.1,
    "fatigue_load_limit_kN": 0.62,
    "limiting_speed_rpm": 16000,
    "speed_oil_rpm": 24000,
    "weight_g": 4,
    "manufacturer_designation": "HK1010FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1010FM",
      "HK1010FM+IR7x10x10.5"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK1010FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 10 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 14 mm cup outside diameter and 10 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.",
    "applications": [
      "automotive accessory drives",
      "lawn and garden equipment spindles",
      "motorcycle and scooter transmissions",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "The 10 mm narrow section of HK1010FM is the compact option at 10 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 10×14 mm envelope.",
      "The open ends of HK1010FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "With no inner ring, HK1010FM reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK1010FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm."
    ],
    "faq": [
      {
        "q": "Can a HK1010FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1010FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK1010FM need a hardened shaft?",
        "a": "Either the 10 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR7x10x10.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1010FM needle roller bearing?",
        "a": "A HK1010FM drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1010FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1010FM, Fw = 10 mm, so the shaft must be machined to 10 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1010FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1012F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 10,
    "D_mm": 14,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 5.65,
    "static_load_kN": 6.8,
    "fatigue_load_limit_kN": 0.83,
    "limiting_speed_rpm": 16000,
    "speed_oil_rpm": 24000,
    "weight_g": 4,
    "manufacturer_designation": "HK1012F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1012F",
      "HK1012F+IR7x10x16"
    ],
    "naming_rule_text": "HK1012F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 10 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 14 mm and the width is 12 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Office automation equipment — printers, copiers, paper feeders — uses this size in the transport rollers, where the open ends are enclosed by the chassis and relubrication is never planned. For vertical shafts, arrange the housing so the open end of the cup faces up or provides a grease reservoir below — gravity drains lubricant away from the roller set otherwise.",
    "applications": [
      "two-stroke engine crank and piston pins",
      "power tool gear reduction stages",
      "small hydraulic pump drives",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "The HK1012F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "With no inner ring, HK1012F reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK1012F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm.",
      "The 12 mm standard width of HK1012F is the general-purpose section at 10 mm shaft; wider HK variants in the same 10×14 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1012F need a hardened shaft?",
        "a": "Either the 10 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR7x10x16) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1012F needle roller bearing?",
        "a": "A HK1012F drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1012F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1012F, Fw = 10 mm, so the shaft must be machined to 10 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1012F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1012F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1012F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1015F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 10,
    "D_mm": 14,
    "B_mm": 15,
    "seal_type": "open",
    "dynamic_load_kN": 7.25,
    "static_load_kN": 9.4,
    "fatigue_load_limit_kN": 1.14,
    "limiting_speed_rpm": 16000,
    "speed_oil_rpm": 24000,
    "weight_g": 6,
    "manufacturer_designation": "HK1015F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1015F",
      "HK1015F+IR7x10x16"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1015F is built around a thin hardened steel cup.Its printed envelope — 10 mm under-roller diameter, 14 mm outside diameter, 15 mm width — is fixed by ISO 3245; the 10 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.",
    "applications": [
      "automotive accessory drives",
      "lawn and garden equipment spindles",
      "motorcycle and scooter transmissions",
      "shock-loaded start-stop service such as clutch and kick-starter mechanisms"
    ],
    "failure_modes": [
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell"
    ],
    "pitfalls": [
      "The HK1015F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "With no inner ring, HK1015F reads the 10 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK1015F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 10 mm.",
      "The 15 mm standard width of HK1015F is the general-purpose section at 10 mm shaft; wider HK variants in the same 10×14 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Drawn-cup needle bearings carry radial load only: HK1015F provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces."
    ],
    "faq": [
      {
        "q": "What duty conditions suit a HK1015F drawn-cup bearing?",
        "a": "HK1015F is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (16000/24000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK1015F needle roller bearing?",
        "a": "A HK1015F drawn-cup needle roller bearing has a 10 mm shaft diameter (Fw, under-roller diameter), 14 mm outside diameter and 15 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1015F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1015F, Fw = 10 mm, so the shaft must be machined to 10 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1015F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1015F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK1015F need a hardened shaft?",
        "a": "Either the 10 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR7x10x16) so a standard unhardened shaft can be used."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1015F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1210FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 12,
    "D_mm": 16,
    "B_mm": 10,
    "seal_type": "open",
    "dynamic_load_kN": 5.05,
    "static_load_kN": 6.25,
    "fatigue_load_limit_kN": 0.76,
    "limiting_speed_rpm": 13000,
    "speed_oil_rpm": 20000,
    "weight_g": 5,
    "manufacturer_designation": "HK1210FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1210FM",
      "HK1210FM+IR8x12x10.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1210FM is built around a thin hardened steel cup.Its printed envelope — 12 mm under-roller diameter, 16 mm outside diameter, 10 mm width — is fixed by ISO 3245; the 12 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.",
    "applications": [
      "two-stroke engine crank and piston pins",
      "power tool gear reduction stages",
      "small hydraulic pump drives",
      "heavily loaded slow pivots where static rating, not dynamic life, governs the choice"
    ],
    "failure_modes": [
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path"
    ],
    "pitfalls": [
      "HK1210FM runs directly on the shaft: the 12 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK1210FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "With no inner ring, HK1210FM reads the 12 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK1210FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 12 mm.",
      "The 10 mm narrow section of HK1210FM is the compact option at 12 mm shaft: load capacity is limited by the short roller length, so verify the required rating before choosing it over a wider HK variant in the same 12×16 mm envelope."
    ],
    "faq": [
      {
        "q": "Does HK1210FM need a hardened shaft?",
        "a": "Either the 12 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR8x12x10.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK1210FM drawn-cup bearing?",
        "a": "HK1210FM is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (13000/20000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK1210FM needle roller bearing?",
        "a": "A HK1210FM drawn-cup needle roller bearing has a 12 mm shaft diameter (Fw, under-roller diameter), 16 mm outside diameter and 10 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1210FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1210FM, Fw = 12 mm, so the shaft must be machined to 12 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1210FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1210FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1210FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1212FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 12,
    "D_mm": 18,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 6.6,
    "static_load_kN": 7.3,
    "fatigue_load_limit_kN": 0.89,
    "limiting_speed_rpm": 13000,
    "speed_oil_rpm": 20000,
    "weight_g": 9,
    "manufacturer_designation": "HK1212FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1212FM",
      "HK1212FM+IR8x12x12.5"
    ],
    "naming_rule_text": "NTN HK1212FM belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 12 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 18 mm outside and 12 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "small hydraulic pump drives",
      "automotive accessory drives",
      "lawn and garden equipment spindles",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "The cage in HK1212FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 12 mm.",
      "The 12 mm standard width of HK1212FM is the general-purpose section at 12 mm shaft; wider HK variants in the same 12×18 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "With no inner ring, HK1212FM reads the 12 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations."
    ],
    "faq": [
      {
        "q": "What does Fw mean on a HK1212FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1212FM, Fw = 12 mm, so the shaft must be machined to 12 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1212FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1212FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK1212FM need a hardened shaft?",
        "a": "Either the 12 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR8x12x12.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1212FM needle roller bearing?",
        "a": "A HK1212FM drawn-cup needle roller bearing has a 12 mm shaft diameter (Fw, under-roller diameter), 18 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1212FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1312FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 13,
    "D_mm": 19,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 6.95,
    "static_load_kN": 7.9,
    "fatigue_load_limit_kN": 0.965,
    "limiting_speed_rpm": 12000,
    "speed_oil_rpm": 18000,
    "weight_g": 10,
    "manufacturer_designation": "HK1312FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1312FM",
      "HK1312FM+IR10x13x12.5"
    ],
    "naming_rule_text": "NTN HK1312FM belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 13 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 19 mm outside and 12 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. This cup size is common in power-tool intermediate shafts — drills, saws, grinders — where the gearbox casing is magnesium or aluminium and the cup is pressed into a steel insert. If the shaft sees axial float, allow for it in the housing width — the cup cannot guide the shaft axially, and a shaft that walks will eventually hammer the open end of the shell.",
    "applications": [
      "power tool gear reduction stages",
      "small hydraulic pump drives",
      "automotive accessory drives",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "HK1312FM runs directly on the shaft: the 13 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK1312FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "With no inner ring, HK1312FM reads the 13 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK1312FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 13 mm.",
      "The 12 mm standard width of HK1312FM is the general-purpose section at 13 mm shaft; wider HK variants in the same 13×19 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1312FM need a hardened shaft?",
        "a": "Either the 13 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR10x13x12.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK1312FM drawn-cup bearing?",
        "a": "HK1312FM is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (12000/18000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK1312FM needle roller bearing?",
        "a": "A HK1312FM drawn-cup needle roller bearing has a 13 mm shaft diameter (Fw, under-roller diameter), 19 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1312FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1312FM, Fw = 13 mm, so the shaft must be machined to 13 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1312FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1312FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1312FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1412FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 14,
    "D_mm": 20,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 7.2,
    "static_load_kN": 8.5,
    "fatigue_load_limit_kN": 1.04,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 17000,
    "weight_g": 11,
    "manufacturer_designation": "HK1412FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1412FM",
      "HK1412FM+IR10x14x13"
    ],
    "naming_rule_text": "The NTN HK1412FM — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 14 mm is Fw, the under-roller (shaft journal) diameter; 20 mm and 12 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. This is the classic two-wheeler and small-engine size class: the cup replaces a bulky machined bearing and lets the gearbox casing shrink around it. Compact hydraulic gear pumps use this size on their drive shafts: the pump housing is machined once, the cup is pressed home, and the shaft runs directly on the rollers for the life of the unit. For oscillating service, pack this size with a high-tackiness grease and re-lubricate at short intervals: the rollers do not complete a full revolution, so the same contact patch carries the load cycle after cycle.",
    "applications": [
      "motorcycle and scooter transmissions",
      "two-stroke engine crank and piston pins",
      "power tool gear reduction stages",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "With no inner ring, HK1412FM reads the 14 mm shaft surface as its raceway: hardness 58–64 HRC and a ground finish are prerequisites, not recommendations.",
      "The cage in HK1412FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 14 mm.",
      "The 12 mm standard width of HK1412FM is the general-purpose section at 14 mm shaft; wider HK variants in the same 14×20 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Needle rollers tolerate almost no misalignment; if the 20 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK1412FM needle roller bearing?",
        "a": "A HK1412FM drawn-cup needle roller bearing has a 14 mm shaft diameter (Fw, under-roller diameter), 20 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1412FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1412FM, Fw = 14 mm, so the shaft must be machined to 14 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1412FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1412FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK1412FM need a hardened shaft?",
        "a": "Either the 14 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR10x14x13) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK1412FM drawn-cup bearing?",
        "a": "HK1412FM is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (11000/17000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1412FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1416F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 14,
    "D_mm": 20,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 10.3,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 1.64,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 17000,
    "weight_g": 15,
    "manufacturer_designation": "HK1416F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1416F"
    ],
    "naming_rule_text": "NTN HK1416F belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 14 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 20 mm outside and 16 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Drawn cups in this class are the default compact radial bearing in motorcycle and power-tool gearboxes, where housing space is the binding constraint. Office automation equipment — printers, copiers, paper feeders — uses this size in the transport rollers, where the open ends are enclosed by the chassis and relubrication is never planned. For vertical shafts, arrange the housing so the open end of the cup faces up or provides a grease reservoir below — gravity drains lubricant away from the roller set otherwise.",
    "applications": [
      "small hydraulic pump drives",
      "automotive accessory drives",
      "lawn and garden equipment spindles",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "The rollers of HK1416F run directly on the 14 mm journal: any score mark, rust pit or plating flake on that surface becomes a raceway defect — dress or replace a marginal shaft.",
      "The cage in HK1416F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 14 mm.",
      "The 16 mm standard width of HK1416F is the general-purpose section at 14 mm shaft; wider HK variants in the same 14×20 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "How is a HK1416F retained in the housing?",
        "a": "The thin-walled drawn cup of HK1416F is press-fitted into a 20 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What are the dimensions of a HK1416F needle roller bearing?",
        "a": "A HK1416F drawn-cup needle roller bearing has a 14 mm shaft diameter (Fw, under-roller diameter), 20 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1416F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1416F, Fw = 14 mm, so the shaft must be machined to 14 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1416F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1416F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1416F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1512FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 15,
    "D_mm": 21,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 7.5,
    "static_load_kN": 9.1,
    "fatigue_load_limit_kN": 1.11,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 16000,
    "weight_g": 11,
    "manufacturer_designation": "HK1512FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1512FM",
      "HK1512FM+IR12x15x12.5"
    ],
    "naming_rule_text": "The NTN HK1512FM — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 15 mm is Fw, the under-roller (shaft journal) diameter; 21 mm and 12 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "The open ends of HK1512FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "Mid-size cups like HK1512FM (15 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK1512FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 15 mm.",
      "The 12 mm standard width of HK1512FM is the general-purpose section at 15 mm shaft; wider HK variants in the same 15×21 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1512FM need a hardened shaft?",
        "a": "Either the 15 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x15x12.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1512FM needle roller bearing?",
        "a": "A HK1512FM drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1512FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1512FM, Fw = 15 mm, so the shaft must be machined to 15 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1512FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1512FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1512FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1516F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 15,
    "D_mm": 21,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 10.7,
    "static_load_kN": 14.4,
    "fatigue_load_limit_kN": 1.75,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 16000,
    "weight_g": 15,
    "manufacturer_designation": "HK1516F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1516F",
      "HK1516F+IR12x15x16.5"
    ],
    "naming_rule_text": "The NTN HK1516F — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 15 mm is Fw, the under-roller (shaft journal) diameter; 21 mm and 16 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.",
    "applications": [
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "compressor crankshaft supports",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "The HK1516F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Before pressing HK1516F in, verify the 15 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.",
      "The cage in HK1516F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 15 mm.",
      "The 16 mm standard width of HK1516F is the general-purpose section at 15 mm shaft; wider HK variants in the same 15×21 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1516F need a hardened shaft?",
        "a": "Either the 15 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x15x16.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1516F needle roller bearing?",
        "a": "A HK1516F drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1516F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1516F, Fw = 15 mm, so the shaft must be machined to 15 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1516F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1516F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1516F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1522ZWFD",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 15,
    "D_mm": 21,
    "B_mm": 22,
    "seal_type": "open",
    "dynamic_load_kN": 12.9,
    "static_load_kN": 18.2,
    "fatigue_load_limit_kN": 2.22,
    "limiting_speed_rpm": 11000,
    "speed_oil_rpm": 16000,
    "weight_g": 20,
    "manufacturer_designation": "HK1522ZWFD",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1522ZWFD",
      "HK1522ZWFD+IR12x15x22.5"
    ],
    "naming_rule_text": "NTN HK1522ZWFD belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 15 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 21 mm outside and 22 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. Automotive steering-column and pedal-box pivots use this size, where the cup is pressed into a sheet-metal bracket and the shaft sees only slow, heavily loaded oscillation. Never re-grease through a drilled hole in the housing wall without a vent path: pressure builds behind the cup, blows grease past the rollers, and starves the bearing while the housing looks full.",
    "applications": [
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "reciprocating or oscillating motion where the rollers never complete a full revolution"
    ],
    "failure_modes": [
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed"
    ],
    "pitfalls": [
      "The 22 mm wide section of HK1522ZWFD gains rating through longer rollers at 15 mm shaft; confirm the housing width accepts 22 mm — it will not drop into a seat machined for the 15×21 mm narrow variant.",
      "The open ends of HK1522ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "At a 15 mm shaft diameter, check housing bore roundness after previous bearing removal for HK1522ZWFD; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.",
      "The two roller rows in HK1522ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 21 mm seat straight over the full 22 mm width and keep shaft deflection minimal."
    ],
    "faq": [
      {
        "q": "Can a HK1522ZWFD needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1522ZWFD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK1522ZWFD need a hardened shaft?",
        "a": "Either the 15 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x15x22.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1522ZWFD needle roller bearing?",
        "a": "A HK1522ZWFD drawn-cup needle roller bearing has a 15 mm shaft diameter (Fw, under-roller diameter), 21 mm outside diameter and 22 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1522ZWFD drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1522ZWFD, Fw = 15 mm, so the shaft must be machined to 15 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1522ZWFD",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1612FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 16,
    "D_mm": 22,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 7.75,
    "static_load_kN": 9.7,
    "fatigue_load_limit_kN": 1.18,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 15000,
    "weight_g": 12,
    "manufacturer_designation": "HK1612FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1612FM",
      "HK1612FM+IR12x16x13"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK1612FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 16 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 22 mm cup outside diameter and 12 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.",
    "applications": [
      "compressor crankshaft supports",
      "agricultural machinery PTO drives",
      "universal joint and steering pivots",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Mid-size cups like HK1612FM (16 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK1612FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 16 mm.",
      "The 12 mm standard width of HK1612FM is the general-purpose section at 16 mm shaft; wider HK variants in the same 16×22 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1612FM need a hardened shaft?",
        "a": "Either the 16 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x16x13) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1612FM needle roller bearing?",
        "a": "A HK1612FM drawn-cup needle roller bearing has a 16 mm shaft diameter (Fw, under-roller diameter), 22 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1612FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1612FM, Fw = 16 mm, so the shaft must be machined to 16 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1612FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1612FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1612FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1616F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 16,
    "D_mm": 22,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 1.87,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 15000,
    "weight_g": 16,
    "manufacturer_designation": "HK1616F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1616F",
      "HK1616F+IR12x16x20"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK1616F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 16 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 22 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "The open ends of HK1616F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "At a 16 mm shaft diameter, check housing bore roundness after previous bearing removal for HK1616F; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.",
      "The cage in HK1616F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 16 mm.",
      "The 16 mm standard width of HK1616F is the general-purpose section at 16 mm shaft; wider HK variants in the same 16×22 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1616F need a hardened shaft?",
        "a": "Either the 16 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR12x16x20) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1616F needle roller bearing?",
        "a": "A HK1616F drawn-cup needle roller bearing has a 16 mm shaft diameter (Fw, under-roller diameter), 22 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1616F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1616F, Fw = 16 mm, so the shaft must be machined to 16 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1616F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1616F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1616F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1622ZWFD",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 16,
    "D_mm": 22,
    "B_mm": 22,
    "seal_type": "open",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 19.4,
    "fatigue_load_limit_kN": 2.37,
    "limiting_speed_rpm": 10000,
    "speed_oil_rpm": 15000,
    "weight_g": 22,
    "manufacturer_designation": "HK1622ZWFD",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1622ZWFD"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1622ZWFD is built around a thin hardened steel cup.Its printed envelope — 16 mm under-roller diameter, 22 mm outside diameter, 22 mm width — is fixed by ISO 3245; the 16 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.",
    "applications": [
      "compressor crankshaft supports",
      "agricultural machinery PTO drives",
      "universal joint and steering pivots",
      "shock-loaded start-stop service such as clutch and kick-starter mechanisms"
    ],
    "failure_modes": [
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell"
    ],
    "pitfalls": [
      "Mid-size cups like HK1622ZWFD (16 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The two roller rows in HK1622ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 22 mm seat straight over the full 22 mm width and keep shaft deflection minimal.",
      "The 22 mm wide section of HK1622ZWFD gains rating through longer rollers at 16 mm shaft; confirm the housing width accepts 22 mm — it will not drop into a seat machined for the 16×22 mm narrow variant.",
      "HK1622ZWFD runs directly on the shaft: the 16 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK1622ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK1622ZWFD needle roller bearing?",
        "a": "A HK1622ZWFD drawn-cup needle roller bearing has a 16 mm shaft diameter (Fw, under-roller diameter), 22 mm outside diameter and 22 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1622ZWFD drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1622ZWFD, Fw = 16 mm, so the shaft must be machined to 16 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1622ZWFD needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1622ZWFD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK1622ZWFD retained in the housing?",
        "a": "The thin-walled drawn cup of HK1622ZWFD is press-fitted into a 22 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What duty conditions suit a HK1622ZWFD drawn-cup bearing?",
        "a": "HK1622ZWFD is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (10000/15000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1622ZWFD",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1712FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 17,
    "D_mm": 23,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 8.05,
    "static_load_kN": 10.3,
    "fatigue_load_limit_kN": 1.26,
    "limiting_speed_rpm": 9500,
    "speed_oil_rpm": 14000,
    "weight_g": 12,
    "manufacturer_designation": "HK1712FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1712FM"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1712FM is built around a thin hardened steel cup.Its printed envelope — 17 mm under-roller diameter, 23 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 17 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.",
    "applications": [
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "compressor crankshaft supports",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "The HK1712FM drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Mid-size cups like HK1712FM (17 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK1712FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 17 mm.",
      "The 12 mm standard width of HK1712FM is the general-purpose section at 17 mm shaft; wider HK variants in the same 17×23 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "How is a HK1712FM retained in the housing?",
        "a": "The thin-walled drawn cup of HK1712FM is press-fitted into a 23 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What are the dimensions of a HK1712FM needle roller bearing?",
        "a": "A HK1712FM drawn-cup needle roller bearing has a 17 mm shaft diameter (Fw, under-roller diameter), 23 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1712FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1712FM, Fw = 17 mm, so the shaft must be machined to 17 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1712FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1712FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1712FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1812FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 18,
    "D_mm": 24,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 8.3,
    "static_load_kN": 10.9,
    "fatigue_load_limit_kN": 1.33,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 13000,
    "weight_g": 13,
    "manufacturer_designation": "HK1812FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1812FM",
      "HK1812FM+IR15x18x12.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK1812FM is built around a thin hardened steel cup.Its printed envelope — 18 mm under-roller diameter, 24 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 18 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Agricultural PTO shafts and small tractor linkages use this size at the pivot points: the cup is pressed into a welded eye and forgotten until the implement is overhauled. Mounting this size in a split housing needs the cup pressed into one half only, with the joint face relieved so the shell is not pinched when the case bolts come up to torque.",
    "applications": [
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "shock-loaded start-stop service such as clutch and kick-starter mechanisms"
    ],
    "failure_modes": [
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Mid-size cups like HK1812FM (18 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK1812FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 18 mm.",
      "The 12 mm standard width of HK1812FM is the general-purpose section at 18 mm shaft; wider HK variants in the same 18×24 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Needle rollers tolerate almost no misalignment; if the 24 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling."
    ],
    "faq": [
      {
        "q": "What duty conditions suit a HK1812FM drawn-cup bearing?",
        "a": "HK1812FM is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (8500/13000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK1812FM needle roller bearing?",
        "a": "A HK1812FM drawn-cup needle roller bearing has a 18 mm shaft diameter (Fw, under-roller diameter), 24 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1812FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1812FM, Fw = 18 mm, so the shaft must be machined to 18 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1812FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1812FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK1812FM need a hardened shaft?",
        "a": "Either the 18 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR15x18x12.5) so a standard unhardened shaft can be used."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1812FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK1816F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 18,
    "D_mm": 24,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 11.8,
    "static_load_kN": 17.3,
    "fatigue_load_limit_kN": 2.11,
    "limiting_speed_rpm": 8500,
    "speed_oil_rpm": 13000,
    "weight_g": 18,
    "manufacturer_designation": "HK1816F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK1816F",
      "HK1816F+IR15x18x16.5"
    ],
    "naming_rule_text": "HK1816F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 18 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 24 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.",
    "applications": [
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "compressor crankshaft supports",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "The HK1816F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Mid-size cups like HK1816F (18 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK1816F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 18 mm.",
      "The 16 mm standard width of HK1816F is the general-purpose section at 18 mm shaft; wider HK variants in the same 18×24 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK1816F need a hardened shaft?",
        "a": "Either the 18 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR15x18x16.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK1816F needle roller bearing?",
        "a": "A HK1816F drawn-cup needle roller bearing has a 18 mm shaft diameter (Fw, under-roller diameter), 24 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK1816F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK1816F, Fw = 18 mm, so the shaft must be machined to 18 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK1816F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK1816F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK1816F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2012FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 20,
    "D_mm": 26,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 8.75,
    "static_load_kN": 12.1,
    "fatigue_load_limit_kN": 1.48,
    "limiting_speed_rpm": 8000,
    "speed_oil_rpm": 12000,
    "weight_g": 14,
    "manufacturer_designation": "HK2012FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2012FM",
      "HK2012FM+IR15x20x13"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK2012FM is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 12 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "reciprocating or oscillating motion where the rollers never complete a full revolution"
    ],
    "failure_modes": [
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed"
    ],
    "pitfalls": [
      "The cage in HK2012FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 20 mm.",
      "The 12 mm standard width of HK2012FM is the general-purpose section at 20 mm shaft; wider HK variants in the same 20×26 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "The open ends of HK2012FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "At a 20 mm shaft diameter, check housing bore roundness after previous bearing removal for HK2012FM; a pulled or scored seat must be re-machined or sleeved before the new cup goes in."
    ],
    "faq": [
      {
        "q": "What does Fw mean on a HK2012FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2012FM, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2012FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2012FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2012FM need a hardened shaft?",
        "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR15x20x13) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2012FM needle roller bearing?",
        "a": "A HK2012FM drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2012FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2016F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 20,
    "D_mm": 26,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 12.5,
    "static_load_kN": 19.2,
    "fatigue_load_limit_kN": 2.34,
    "limiting_speed_rpm": 8000,
    "speed_oil_rpm": 12000,
    "weight_g": 19,
    "manufacturer_designation": "HK2016F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2016F",
      "HK2016F+IR17x20x16.5"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK2016F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "compressor crankshaft supports",
      "agricultural machinery PTO drives",
      "universal joint and steering pivots",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Before pressing HK2016F in, verify the 20 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.",
      "The cage in HK2016F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 20 mm.",
      "The 16 mm standard width of HK2016F is the general-purpose section at 20 mm shaft; wider HK variants in the same 20×26 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK2016F need a hardened shaft?",
        "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x20x16.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2016F needle roller bearing?",
        "a": "A HK2016F drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2016F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2016F, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2016F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2016F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2016F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2020F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 20,
    "D_mm": 26,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 16,
    "static_load_kN": 26.2,
    "fatigue_load_limit_kN": 3.2,
    "limiting_speed_rpm": 8000,
    "speed_oil_rpm": 12000,
    "weight_g": 24,
    "manufacturer_designation": "HK2020F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2020F",
      "HK2020F+IR17x20x20.5"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK2020F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 20 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Marine outboard and small diesel linkage points use this size: the pressed-in cup tolerates the corrosion-prone environment better than a machined ring with a separate inner race. In high-speed applications, switch from grease to a circulating oil supply: the open ends let oil through, but grease at high speed channels and overheats the roller set.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "Drawn-cup needle bearings carry radial load only: HK2020F provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.",
      "The HK2020F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Mid-size cups like HK2020F (20 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK2020F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 20 mm.",
      "The 20 mm wide section of HK2020F gains rating through longer rollers at 20 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 20×26 mm narrow variant."
    ],
    "faq": [
      {
        "q": "Does HK2020F need a hardened shaft?",
        "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x20x20.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK2020F drawn-cup bearing?",
        "a": "HK2020F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (8000/12000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK2020F needle roller bearing?",
        "a": "A HK2020F drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2020F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2020F, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2020F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2020F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2020F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2030ZWFD",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 20,
    "D_mm": 26,
    "B_mm": 30,
    "seal_type": "open",
    "dynamic_load_kN": 21.5,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 4.7,
    "limiting_speed_rpm": 8000,
    "speed_oil_rpm": 12000,
    "weight_g": 35,
    "manufacturer_designation": "HK2030ZWFD",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2030ZWFD",
      "HK2030ZWFD+IR17x20x30.5"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK2030ZWFD is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 20 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 26 mm cup outside diameter and 30 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Marine outboard and small diesel linkage points use this size: the pressed-in cup tolerates the corrosion-prone environment better than a machined ring with a separate inner race. In high-speed applications, switch from grease to a circulating oil supply: the open ends let oil through, but grease at high speed channels and overheats the roller set.",
    "applications": [
      "agricultural machinery PTO drives",
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "compact linkages where the cup doubles as both bearing and structural spacer"
    ],
    "failure_modes": [
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection"
    ],
    "pitfalls": [
      "The open ends of HK2030ZWFD retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "Before pressing HK2030ZWFD in, verify the 20 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.",
      "The two roller rows in HK2030ZWFD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 26 mm seat straight over the full 30 mm width and keep shaft deflection minimal.",
      "The 30 mm extra-wide section of HK2030ZWFD (double-row or extended roller set) is the high-capacity option at 20 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 30 mm width.",
      "HK2030ZWFD runs directly on the shaft: the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead."
    ],
    "faq": [
      {
        "q": "What duty conditions suit a HK2030ZWFD drawn-cup bearing?",
        "a": "HK2030ZWFD is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (8000/12000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK2030ZWFD needle roller bearing?",
        "a": "A HK2030ZWFD drawn-cup needle roller bearing has a 20 mm shaft diameter (Fw, under-roller diameter), 26 mm outside diameter and 30 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2030ZWFD drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2030ZWFD, Fw = 20 mm, so the shaft must be machined to 20 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2030ZWFD needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2030ZWFD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2030ZWFD need a hardened shaft?",
        "a": "Either the 20 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x20x30.5) so a standard unhardened shaft can be used."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2030ZWFD",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2212FM",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 22,
    "D_mm": 28,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 9.2,
    "static_load_kN": 13.4,
    "fatigue_load_limit_kN": 1.63,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 11000,
    "weight_g": 13,
    "manufacturer_designation": "HK2212FM",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2212FM",
      "HK2212FM+IR17x22x13"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK2212FM is built around a thin hardened steel cup.Its printed envelope — 22 mm under-roller diameter, 28 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 22 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The FM/FT2 suffix marks NTN's caged drawn-cup execution: a formed steel cage keeps the rollers evenly spaced, lowering friction and noise versus full-complement drawn cups. In this mid size range the HK cup is the standard compact radial bearing choice across automotive and industrial gearboxes. Compact hydraulic gear pumps use this size on their drive shafts: the pump housing is machined once, the cup is pressed home, and the shaft runs directly on the rollers for the life of the unit. For oscillating service, pack this size with a high-tackiness grease and re-lubricate at short intervals: the rollers do not complete a full revolution, so the same contact patch carries the load cycle after cycle.",
    "applications": [
      "hydraulic pump and motor shafts",
      "compressor crankshaft supports",
      "agricultural machinery PTO drives",
      "compact linkages where the cup doubles as both bearing and structural spacer"
    ],
    "failure_modes": [
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection"
    ],
    "pitfalls": [
      "The open ends of HK2212FM retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "At a 22 mm shaft diameter, check housing bore roundness after previous bearing removal for HK2212FM; a pulled or scored seat must be re-machined or sleeved before the new cup goes in.",
      "The cage in HK2212FM spaces the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 22 mm.",
      "The 12 mm standard width of HK2212FM is the general-purpose section at 22 mm shaft; wider HK variants in the same 22×28 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "HK2212FM runs directly on the shaft: the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead."
    ],
    "faq": [
      {
        "q": "What duty conditions suit a HK2212FM drawn-cup bearing?",
        "a": "HK2212FM is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (7500/11000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK2212FM needle roller bearing?",
        "a": "A HK2212FM drawn-cup needle roller bearing has a 22 mm shaft diameter (Fw, under-roller diameter), 28 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2212FM drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2212FM, Fw = 22 mm, so the shaft must be machined to 22 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2212FM needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2212FM carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2212FM need a hardened shaft?",
        "a": "Either the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x22x13) so a standard unhardened shaft can be used."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2212FM",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2216F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 22,
    "D_mm": 28,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 13.2,
    "static_load_kN": 21.1,
    "fatigue_load_limit_kN": 2.57,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 11000,
    "weight_g": 21,
    "manufacturer_designation": "HK2216F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2216F",
      "HK2216F+IR17x22x18"
    ],
    "naming_rule_text": "HK2216F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 22 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 28 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "The open ends of HK2216F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "Mid-size cups like HK2216F (22 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK2216F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 22 mm.",
      "The 16 mm standard width of HK2216F is the general-purpose section at 22 mm shaft; wider HK variants in the same 22×28 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK2216F need a hardened shaft?",
        "a": "Either the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x22x18) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2216F needle roller bearing?",
        "a": "A HK2216F drawn-cup needle roller bearing has a 22 mm shaft diameter (Fw, under-roller diameter), 28 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2216F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2216F, Fw = 22 mm, so the shaft must be machined to 22 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2216F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2216F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2216F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2220F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 22,
    "D_mm": 28,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 16.8,
    "static_load_kN": 28.8,
    "fatigue_load_limit_kN": 3.5,
    "limiting_speed_rpm": 7500,
    "speed_oil_rpm": 11000,
    "weight_g": 26,
    "manufacturer_designation": "HK2220F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2220F",
      "HK2220F+IR17x22x20.5"
    ],
    "naming_rule_text": "HK2220F is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 22 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 28 mm and the width is 20 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Small compressor crankshafts and refrigeration equipment fit this size on the eccentric pin, where the housing bore is finish-bored in the same setup as the main bearing seats. Where the housing is a welded fabrication, finish-bore the seat after all welding and stress-relief is complete — pressing the cup into a distorted, as-welded bore guarantees early spalling.",
    "applications": [
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "compressor crankshaft supports",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "The 20 mm wide section of HK2220F gains rating through longer rollers at 22 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 22×28 mm narrow variant.",
      "Needle rollers tolerate almost no misalignment; if the 28 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Before pressing HK2220F in, verify the 22 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.",
      "The cage in HK2220F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 22 mm."
    ],
    "faq": [
      {
        "q": "Can a HK2220F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2220F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2220F need a hardened shaft?",
        "a": "Either the 22 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR17x22x20.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK2220F drawn-cup bearing?",
        "a": "HK2220F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (7500/11000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK2220F needle roller bearing?",
        "a": "A HK2220F drawn-cup needle roller bearing has a 22 mm shaft diameter (Fw, under-roller diameter), 28 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2220F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2220F, Fw = 22 mm, so the shaft must be machined to 22 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2220F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2512F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 25,
    "D_mm": 32,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 11.1,
    "static_load_kN": 15.2,
    "fatigue_load_limit_kN": 1.85,
    "limiting_speed_rpm": 6500,
    "speed_oil_rpm": 9500,
    "weight_g": 21,
    "manufacturer_designation": "HK2512F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2512F",
      "HK2512F+IR20x25x12.5"
    ],
    "naming_rule_text": "NTN HK2512F belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 25 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 32 mm outside and 12 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Agricultural PTO shafts and small tractor linkages use this size at the pivot points: the cup is pressed into a welded eye and forgotten until the implement is overhauled. Mounting this size in a split housing needs the cup pressed into one half only, with the joint face relieved so the shell is not pinched when the case bolts come up to torque.",
    "applications": [
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "compressor crankshaft supports",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "The HK2512F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Mid-size cups like HK2512F (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "The cage in HK2512F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 25 mm.",
      "The 12 mm standard width of HK2512F is the general-purpose section at 25 mm shaft; wider HK variants in the same 25×32 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK2512F need a hardened shaft?",
        "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x12.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2512F needle roller bearing?",
        "a": "A HK2512F drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2512F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2512F, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2512F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2512F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2512F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2516F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 25,
    "D_mm": 32,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 15.9,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 2.92,
    "limiting_speed_rpm": 6500,
    "speed_oil_rpm": 9500,
    "weight_g": 27,
    "manufacturer_designation": "HK2516F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2516F",
      "HK2516F+IR20x25x17"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK2516F is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 25 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 32 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Automotive gearbox designers default to this class when the radial envelope is fixed: the cup keeps the casing compact without giving up the required rating. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "intermittent duty with long standstill periods that invite false brinelling"
    ],
    "failure_modes": [
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness"
    ],
    "pitfalls": [
      "The open ends of HK2516F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "Before pressing HK2516F in, verify the 25 mm housing seat is still round — extracting the old cup often pulls the bore, and the new thin shell will conform to any distortion.",
      "The cage in HK2516F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 25 mm.",
      "The 16 mm standard width of HK2516F is the general-purpose section at 25 mm shaft; wider HK variants in the same 25×32 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK2516F need a hardened shaft?",
        "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x17) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2516F needle roller bearing?",
        "a": "A HK2516F drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2516F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2516F, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2516F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2516F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2516F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2520",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 25,
    "D_mm": 32,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 20.3,
    "static_load_kN": 33,
    "fatigue_load_limit_kN": 4,
    "limiting_speed_rpm": 6500,
    "speed_oil_rpm": 9500,
    "weight_g": 34,
    "manufacturer_designation": "HK2520",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2520",
      "HK2520+IR20x25x20.5"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK2520 is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 25 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 32 mm cup outside diameter and 20 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "Drawn-cup needle bearings carry radial load only: HK2520 provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.",
      "The HK2520 drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Mid-size cups like HK2520 (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "With no suffix letters, HK2520 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 25×32×20 mm match exactly — suffix conventions for cage and shell variants differ between makers.",
      "The 20 mm wide section of HK2520 gains rating through longer rollers at 25 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 25×32 mm narrow variant."
    ],
    "faq": [
      {
        "q": "Does HK2520 need a hardened shaft?",
        "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x20.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK2520 drawn-cup bearing?",
        "a": "HK2520 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (6500/9500 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK2520 needle roller bearing?",
        "a": "A HK2520 drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2520 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2520, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2520 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2520 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2520-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 25×32×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      }
    ]
  },
  {
    "sku": "HK2526C",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 25,
    "D_mm": 32,
    "B_mm": 26,
    "seal_type": "open",
    "dynamic_load_kN": 26.4,
    "static_load_kN": 46,
    "fatigue_load_limit_kN": 5.6,
    "limiting_speed_rpm": 6500,
    "speed_oil_rpm": 9500,
    "weight_g": 45,
    "manufacturer_designation": "HK2526C",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2526C",
      "HK2526C+IR20x25x26.5"
    ],
    "naming_rule_text": "The NTN HK2526C — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 25 mm is Fw, the under-roller (shaft journal) diameter; 32 mm and 26 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.",
    "applications": [
      "universal joint and steering pivots",
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "reciprocating or oscillating motion where the rollers never complete a full revolution"
    ],
    "failure_modes": [
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Mid-size cups like HK2526C (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short.",
      "HK2526C carries a maker-specific variant code after the size: when substituting another brand, match the printed 25×32×26 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.",
      "The 26 mm extra-wide section of HK2526C (double-row or extended roller set) is the high-capacity option at 25 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 26 mm width."
    ],
    "faq": [
      {
        "q": "Does HK2526C need a hardened shaft?",
        "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x26.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2526C needle roller bearing?",
        "a": "A HK2526C drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 26 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2526C drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2526C, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2526C needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2526C carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2526C",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2538ZWD",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 25,
    "D_mm": 32,
    "B_mm": 38,
    "seal_type": "open",
    "dynamic_load_kN": 35,
    "static_load_kN": 65.5,
    "fatigue_load_limit_kN": 8,
    "limiting_speed_rpm": 6500,
    "speed_oil_rpm": 9500,
    "weight_g": 65,
    "manufacturer_designation": "HK2538ZWD",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2538ZWD",
      "HK2538ZWD+IR20x25x38.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK2538ZWD is built around a thin hardened steel cup.Its printed envelope — 25 mm under-roller diameter, 32 mm outside diameter, 38 mm width — is fixed by ISO 3245; the 25 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. Mid-size drawn cups like this appear throughout passenger-car and light-truck transmissions, pressed into cast housings where a machined ring would not fit. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.",
    "applications": [
      "automotive manual transmission gear sets",
      "industrial gearbox lay shafts",
      "hydraulic pump and motor shafts",
      "shock-loaded start-stop service such as clutch and kick-starter mechanisms"
    ],
    "failure_modes": [
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell"
    ],
    "pitfalls": [
      "The two roller rows in HK2538ZWD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 32 mm seat straight over the full 38 mm width and keep shaft deflection minimal.",
      "The 38 mm extra-wide section of HK2538ZWD (double-row or extended roller set) is the high-capacity option at 25 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 38 mm width.",
      "Drawn-cup needle bearings carry radial load only: HK2538ZWD provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.",
      "The HK2538ZWD drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Mid-size cups like HK2538ZWD (25 mm shaft) inherit the shape of their seat: a scored or oval housing bore from the previous bearing will cut the new bearing's life short."
    ],
    "faq": [
      {
        "q": "What does Fw mean on a HK2538ZWD drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2538ZWD, Fw = 25 mm, so the shaft must be machined to 25 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2538ZWD needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2538ZWD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2538ZWD need a hardened shaft?",
        "a": "Either the 25 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR20x25x38.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK2538ZWD drawn-cup bearing?",
        "a": "HK2538ZWD is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (6500/9500 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK2538ZWD needle roller bearing?",
        "a": "A HK2538ZWD drawn-cup needle roller bearing has a 25 mm shaft diameter (Fw, under-roller diameter), 32 mm outside diameter and 38 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2538ZWD",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2816CT",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 28,
    "D_mm": 35,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 16.7,
    "static_load_kN": 26.4,
    "fatigue_load_limit_kN": 3.2,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8500,
    "weight_g": 30,
    "manufacturer_designation": "HK2816CT",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2816CT",
      "HK2816CT+IR22x28x17"
    ],
    "naming_rule_text": "The NTN HK2816CT — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 28 mm is Fw, the under-roller (shaft journal) diameter; 35 mm and 16 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Garden machinery and small outboard engines fit this size in the crankcase web: the thin cup keeps the crank web narrow while still carrying the combustion pulses through the connecting-rod small end. Use a mandrel with a lead chamfer that matches the cup bore when pressing this size home; a flat-faced drift can catch the roller cage and distort the shell before it is fully seated.",
    "applications": [
      "heavy gearbox and final drive shafts",
      "construction equipment swing pivots",
      "printing press cylinder journals",
      "compact linkages where the cup doubles as both bearing and structural spacer"
    ],
    "failure_modes": [
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection"
    ],
    "pitfalls": [
      "The press-fit of HK2816CT at 28 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "HK2816CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 28×35×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.",
      "The 16 mm standard width of HK2816CT is the general-purpose section at 28 mm shaft; wider HK variants in the same 28×35 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Needle rollers tolerate almost no misalignment; if the 35 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK2816CT needle roller bearing?",
        "a": "A HK2816CT drawn-cup needle roller bearing has a 28 mm shaft diameter (Fw, under-roller diameter), 35 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2816CT drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2816CT, Fw = 28 mm, so the shaft must be machined to 28 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK2816CT needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2816CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2816CT need a hardened shaft?",
        "a": "Either the 28 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR22x28x17) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK2816CT drawn-cup bearing?",
        "a": "HK2816CT is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (5500/8500 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2816CT",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK2820",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 28,
    "D_mm": 35,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 21.3,
    "static_load_kN": 36,
    "fatigue_load_limit_kN": 4.4,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8500,
    "weight_g": 38,
    "manufacturer_designation": "HK2820",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK2820",
      "HK2820+IR22x28x20.5"
    ],
    "naming_rule_text": "The NTN HK2820 — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 28 mm is Fw, the under-roller (shaft journal) diameter; 35 mm and 20 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. This cup size is common in power-tool intermediate shafts — drills, saws, grinders — where the gearbox casing is magnesium or aluminium and the cup is pressed into a steel insert. If the shaft sees axial float, allow for it in the housing width — the cup cannot guide the shaft axially, and a shaft that walks will eventually hammer the open end of the shell.",
    "applications": [
      "printing press cylinder journals",
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "The 20 mm wide section of HK2820 gains rating through longer rollers at 28 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 28×35 mm narrow variant.",
      "The HK2820 drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Pressing HK2820 (28 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.",
      "With no suffix letters, HK2820 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 28×35×20 mm match exactly — suffix conventions for cage and shell variants differ between makers."
    ],
    "faq": [
      {
        "q": "Can a HK2820 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK2820 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK2820 need a hardened shaft?",
        "a": "Either the 28 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR22x28x20.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK2820 needle roller bearing?",
        "a": "A HK2820 drawn-cup needle roller bearing has a 28 mm shaft diameter (Fw, under-roller diameter), 35 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK2820 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK2820, Fw = 28 mm, so the shaft must be machined to 28 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK2820-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 28×35×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      }
    ]
  },
  {
    "sku": "HK3012CT",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 30,
    "D_mm": 37,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 12.3,
    "static_load_kN": 18.2,
    "fatigue_load_limit_kN": 2.22,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8000,
    "weight_g": 24,
    "manufacturer_designation": "HK3012CT",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3012CT",
      "HK3012CT+IR25x30x12.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3012CT is built around a thin hardened steel cup.Its printed envelope — 30 mm under-roller diameter, 37 mm outside diameter, 12 mm width — is fixed by ISO 3245; the 30 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Model and hobby drivetrains, from RC cars to small robotics, use this size because the thin cup lets designers shrink the gearbox around the gears rather than around the bearing. For low-temperature service, verify the grease is rated for the minimum ambient — a standard lithium grease in this cup will stiffen and starve the rollers on a cold start.",
    "applications": [
      "construction equipment swing pivots",
      "printing press cylinder journals",
      "machine tool feed drive supports",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "The HK3012CT drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life.",
      "Pressing HK3012CT (30 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.",
      "HK3012CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 30×37×12 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.",
      "The 12 mm standard width of HK3012CT is the general-purpose section at 30 mm shaft; wider HK variants in the same 30×37 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK3012CT need a hardened shaft?",
        "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x12.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK3012CT needle roller bearing?",
        "a": "A HK3012CT drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK3012CT drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3012CT, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK3012CT needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3012CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3012CT",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "7E-HK3016C",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 30,
    "D_mm": 37,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 18.1,
    "static_load_kN": 30,
    "fatigue_load_limit_kN": 3.65,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8000,
    "weight_g": 32,
    "manufacturer_designation": "7E-HK3016C",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "7E-HK3016C",
      "7E-HK3016C+IR25x30x17"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), 7E-HK3016C is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 30 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 37 mm cup outside diameter and 16 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.",
    "applications": [
      "printing press cylinder journals",
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "heavily loaded slow pivots where static rating, not dynamic life, governs the choice"
    ],
    "failure_modes": [
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting",
      "grease starvation in the open-end arrangement with no relubrication path"
    ],
    "pitfalls": [
      "The 16 mm standard width of 7E-HK3016C is the general-purpose section at 30 mm shaft; wider HK variants in the same 30×37 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "7E-HK3016C runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of 7E-HK3016C retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "The press-fit of 7E-HK3016C at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "7E-HK3016C carries a maker-specific variant code after the size: when substituting another brand, match the printed 30×37×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers."
    ],
    "faq": [
      {
        "q": "Can a 7E-HK3016C needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like 7E-HK3016C carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does 7E-HK3016C need a hardened shaft?",
        "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x17) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a 7E-HK3016C drawn-cup bearing?",
        "a": "7E-HK3016C is typically specified for reciprocating or oscillating motion where the rollers never complete a full revolution; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a 7E-HK3016C needle roller bearing?",
        "a": "A 7E-HK3016C drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a 7E-HK3016C drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For 7E-HK3016C, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "7E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK3020F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 30,
    "D_mm": 37,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 22.3,
    "static_load_kN": 39.5,
    "fatigue_load_limit_kN": 4.8,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8000,
    "weight_g": 40,
    "manufacturer_designation": "HK3020F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3020F",
      "HK3020F+IR25x30x20.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3020F is built around a thin hardened steel cup.Its printed envelope — 30 mm under-roller diameter, 37 mm outside diameter, 20 mm width — is fixed by ISO 3245; the 30 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Small electric actuators and valve gear specify this size on the output shaft, where the gearmotor pinion needs support but the casting leaves no room for a machined ring. In dusty environments, place an external lip seal or felt washer immediately adjacent to the open cup end; the rollers have no defence against grit that migrates through the housing.",
    "applications": [
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "rolling mill auxiliary drives",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "The press-fit of HK3020F at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "The cage in HK3020F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 30 mm.",
      "The 20 mm wide section of HK3020F gains rating through longer rollers at 30 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 30×37 mm narrow variant.",
      "HK3020F runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK3020F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK3020F needle roller bearing?",
        "a": "A HK3020F drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK3020F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3020F, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK3020F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3020F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK3020F need a hardened shaft?",
        "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x20.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK3020F drawn-cup bearing?",
        "a": "HK3020F is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3020F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK3026F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 30,
    "D_mm": 37,
    "B_mm": 26,
    "seal_type": "open",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 54,
    "fatigue_load_limit_kN": 6.55,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8000,
    "weight_g": 53,
    "manufacturer_designation": "HK3026F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3026F",
      "HK3026F+IR25x30x26.5"
    ],
    "naming_rule_text": "The NTN HK3026F — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 30 mm is Fw, the under-roller (shaft journal) diameter; 37 mm and 26 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.",
    "applications": [
      "marine steering and linkage shafts",
      "rolling mill auxiliary drives",
      "heavy gearbox and final drive shafts",
      "shock-loaded start-stop service such as clutch and kick-starter mechanisms"
    ],
    "failure_modes": [
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell"
    ],
    "pitfalls": [
      "The 26 mm extra-wide section of HK3026F (double-row or extended roller set) is the high-capacity option at 30 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 26 mm width.",
      "HK3026F runs directly on the shaft: the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK3026F retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "The press-fit of HK3026F at 30 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "The cage in HK3026F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 30 mm."
    ],
    "faq": [
      {
        "q": "Can a HK3026F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3026F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK3026F need a hardened shaft?",
        "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x26.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK3026F drawn-cup bearing?",
        "a": "HK3026F is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (5500/8000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK3026F needle roller bearing?",
        "a": "A HK3026F drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 26 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK3026F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3026F, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3026F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK3038ZWD",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 30,
    "D_mm": 37,
    "B_mm": 38,
    "seal_type": "open",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 78.5,
    "fatigue_load_limit_kN": 9.6,
    "limiting_speed_rpm": 5500,
    "speed_oil_rpm": 8000,
    "weight_g": 76,
    "manufacturer_designation": "HK3038ZWD",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3038ZWD",
      "HK3038ZWD+IR25x30x38.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3038ZWD is built around a thin hardened steel cup.Its printed envelope — 30 mm under-roller diameter, 37 mm outside diameter, 38 mm width — is fixed by ISO 3245; the 30 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The ZW suffix marks two roller rows in the same cup, roughly doubling the dynamic rating of the width-equivalent single-row version at the cost of the extra width. At this shaft size the cup carries substantial radial load, but correct press-fit practice and housing rigidity become decisive for reaching the calculated life. This size is specified in printing-press folder and cutter mechanisms, where the shaft is short, the loads are cyclical, and the thin cup lets the frame plates stay close together. When replacing this size, measure the housing bore with a plug gauge before pressing the new cup: a bore worn oversize by the previous bearing will not retain the new shell.",
    "applications": [
      "rolling mill auxiliary drives",
      "heavy gearbox and final drive shafts",
      "construction equipment swing pivots",
      "reciprocating or oscillating motion where the rollers never complete a full revolution"
    ],
    "failure_modes": [
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "At a 30 mm shaft diameter the press-in force for HK3038ZWD is substantial; use a press with a guided mandrel and confirm the cup seats against the housing shoulder — a cocked cup concentrates load on the outermost roller row.",
      "The two roller rows in HK3038ZWD share one cup: any shaft bending or housing-bore taper loads one row ahead of the other, so hold the 37 mm seat straight over the full 38 mm width and keep shaft deflection minimal.",
      "The 38 mm extra-wide section of HK3038ZWD (double-row or extended roller set) is the high-capacity option at 30 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 38 mm width."
    ],
    "faq": [
      {
        "q": "Does HK3038ZWD need a hardened shaft?",
        "a": "Either the 30 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR25x30x38.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK3038ZWD needle roller bearing?",
        "a": "A HK3038ZWD drawn-cup needle roller bearing has a 30 mm shaft diameter (Fw, under-roller diameter), 37 mm outside diameter and 38 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK3038ZWD drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3038ZWD, Fw = 30 mm, so the shaft must be machined to 30 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK3038ZWD needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3038ZWD carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3038ZWD",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK3512CV2",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 35,
    "D_mm": 42,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 13.3,
    "static_load_kN": 21.3,
    "fatigue_load_limit_kN": 2.6,
    "limiting_speed_rpm": 4700,
    "speed_oil_rpm": 7000,
    "weight_g": 28,
    "manufacturer_designation": "HK3512CV2",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3512CV2"
    ],
    "naming_rule_text": "The NTN HK3512CV2 — an open-end drawn-cup needle roller bearing — sits in the HK-series under ISO 3245 boundary dimensions.Reading the size code: 35 mm is Fw, the under-roller (shaft journal) diameter; 42 mm and 12 mm are the cup outside diameter and width respectively. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Agricultural PTO shafts and small tractor linkages use this size at the pivot points: the cup is pressed into a welded eye and forgotten until the implement is overhauled. Mounting this size in a split housing needs the cup pressed into one half only, with the joint face relieved so the shell is not pinched when the case bolts come up to torque.",
    "applications": [
      "heavy gearbox and final drive shafts",
      "construction equipment swing pivots",
      "printing press cylinder journals",
      "shock-loaded start-stop service such as clutch and kick-starter mechanisms"
    ],
    "failure_modes": [
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell"
    ],
    "pitfalls": [
      "Pressing HK3512CV2 (35 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.",
      "HK3512CV2 carries a maker-specific variant code after the size: when substituting another brand, match the printed 35×42×12 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.",
      "The 12 mm standard width of HK3512CV2 is the general-purpose section at 35 mm shaft; wider HK variants in the same 35×42 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Needle rollers tolerate almost no misalignment; if the 42 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK3512CV2 needle roller bearing?",
        "a": "A HK3512CV2 drawn-cup needle roller bearing has a 35 mm shaft diameter (Fw, under-roller diameter), 42 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK3512CV2 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3512CV2, Fw = 35 mm, so the shaft must be machined to 35 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK3512CV2 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3512CV2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK3512CV2 retained in the housing?",
        "a": "The thin-walled drawn cup of HK3512CV2 is press-fitted into a 42 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What duty conditions suit a HK3512CV2 drawn-cup bearing?",
        "a": "HK3512CV2 is typically specified for dirty environments where the open ends rely entirely on the housing seals; match the grease/oil speed limits (4700/7000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3512CV2",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK3516CT",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 35,
    "D_mm": 42,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 19,
    "static_load_kN": 33.5,
    "fatigue_load_limit_kN": 4.1,
    "limiting_speed_rpm": 4700,
    "speed_oil_rpm": 7000,
    "weight_g": 37,
    "manufacturer_designation": "HK3516CT",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3516CT"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3516CT is built around a thin hardened steel cup.Its printed envelope — 35 mm under-roller diameter, 42 mm outside diameter, 16 mm width — is fixed by ISO 3245; the 35 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Conveyor and packaging-machinery builders choose this size for idler and tensioner rollers: the open ends accept a grease fill at assembly and the cup survives the life of the roller shell. When the housing is aluminium or magnesium, press this cup into a steel insert rather than the bare casting — differential thermal expansion will walk the cup out of a soft bore at operating temperature.",
    "applications": [
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "rolling mill auxiliary drives",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "HK3516CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 35×42×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.",
      "The 16 mm standard width of HK3516CT is the general-purpose section at 35 mm shaft; wider HK variants in the same 35×42 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Pressing HK3516CT (35 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder."
    ],
    "faq": [
      {
        "q": "What does Fw mean on a HK3516CT drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3516CT, Fw = 35 mm, so the shaft must be machined to 35 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK3516CT needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3516CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK3516CT retained in the housing?",
        "a": "The thin-walled drawn cup of HK3516CT is press-fitted into a 42 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What are the dimensions of a HK3516CT needle roller bearing?",
        "a": "A HK3516CT drawn-cup needle roller bearing has a 35 mm shaft diameter (Fw, under-roller diameter), 42 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3516CT",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK3520",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 35,
    "D_mm": 42,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 24.8,
    "static_load_kN": 47.5,
    "fatigue_load_limit_kN": 5.8,
    "limiting_speed_rpm": 4700,
    "speed_oil_rpm": 7000,
    "weight_g": 46,
    "manufacturer_designation": "HK3520",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK3520"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK3520 is built around a thin hardened steel cup.Its printed envelope — 35 mm under-roller diameter, 42 mm outside diameter, 20 mm width — is fixed by ISO 3245; the 35 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. Model and hobby drivetrains, from RC cars to small robotics, use this size because the thin cup lets designers shrink the gearbox around the gears rather than around the bearing. For low-temperature service, verify the grease is rated for the minimum ambient — a standard lithium grease in this cup will stiffen and starve the rollers on a cold start.",
    "applications": [
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "rolling mill auxiliary drives",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "Pressing HK3520 (35 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.",
      "With no suffix letters, HK3520 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 35×42×20 mm match exactly — suffix conventions for cage and shell variants differ between makers.",
      "The 20 mm wide section of HK3520 gains rating through longer rollers at 35 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 35×42 mm narrow variant.",
      "HK3520 runs directly on the shaft: the 35 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK3520 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK3520 needle roller bearing?",
        "a": "A HK3520 drawn-cup needle roller bearing has a 35 mm shaft diameter (Fw, under-roller diameter), 42 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK3520 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK3520, Fw = 35 mm, so the shaft must be machined to 35 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK3520 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK3520 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "How is a HK3520 retained in the housing?",
        "a": "The thin-walled drawn cup of HK3520 is press-fitted into a 42 mm housing bore (typically N6/N7 tolerance for steel housings). The press fit alone retains the cup — no snap rings or shoulders are needed, but the bore must be round and rigid."
      },
      {
        "q": "What duty conditions suit a HK3520 drawn-cup bearing?",
        "a": "HK3520 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (4700/7000 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK3520-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 35×42×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      }
    ]
  },
  {
    "sku": "HK4012V2",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 40,
    "D_mm": 47,
    "B_mm": 12,
    "seal_type": "open",
    "dynamic_load_kN": 12.1,
    "static_load_kN": 19.5,
    "fatigue_load_limit_kN": 2.38,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 6000,
    "weight_g": 31,
    "manufacturer_designation": "HK4012V2",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK4012V2",
      "HK4012V2+IR35x40x12.5"
    ],
    "naming_rule_text": "In the HK-series (ISO 3245), HK4012V2 is NTN's open-end drawn-cup needle roller bearing.Boundary dimensions are 40 mm under-roller diameter (Fw — the shaft journal acts as the raceway), 47 mm cup outside diameter and 12 mm width. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.",
    "applications": [
      "printing press cylinder journals",
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "compact linkages where the cup doubles as both bearing and structural spacer"
    ],
    "failure_modes": [
      "grease starvation in the open-end arrangement with no relubrication path",
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection"
    ],
    "pitfalls": [
      "The 12 mm standard width of HK4012V2 is the general-purpose section at 40 mm shaft; wider HK variants in the same 40×47 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "HK4012V2 runs directly on the shaft: the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or fit the matching IR inner ring instead.",
      "The open ends of HK4012V2 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "The press-fit of HK4012V2 at 40 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "HK4012V2 carries a maker-specific variant code after the size: when substituting another brand, match the printed 40×47×12 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers."
    ],
    "faq": [
      {
        "q": "Can a HK4012V2 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK4012V2 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK4012V2 need a hardened shaft?",
        "a": "Either the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR35x40x12.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK4012V2 drawn-cup bearing?",
        "a": "HK4012V2 is typically specified for lightly loaded high-speed idler positions where roller skidding must be watched; match the grease/oil speed limits (4000/6000 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK4012V2 needle roller bearing?",
        "a": "A HK4012V2 drawn-cup needle roller bearing has a 40 mm shaft diameter (Fw, under-roller diameter), 47 mm outside diameter and 12 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK4012V2 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4012V2, Fw = 40 mm, so the shaft must be machined to 40 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK4012V2",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK4016CT",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 40,
    "D_mm": 47,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 20.3,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 4.7,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 6000,
    "weight_g": 41,
    "manufacturer_designation": "HK4016CT",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK4016CT",
      "HK4016CT+IR35x40x17"
    ],
    "naming_rule_text": "HK4016CT is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 40 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 47 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The trailing code letters mark a production-variant shell or cage execution; the boundary dimensions match the base HK size, so interchange checks should rely on the printed Fw/D/C values. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "rolling mill auxiliary drives",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "The press-fit of HK4016CT at 40 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "HK4016CT carries a maker-specific variant code after the size: when substituting another brand, match the printed 40×47×16 mm boundary dimensions and load ratings rather than the suffix letters, which are not standardized across makers.",
      "The 16 mm standard width of HK4016CT is the general-purpose section at 40 mm shaft; wider HK variants in the same 40×47 mm envelope carry more load and are not interchangeable if the housing width is fixed."
    ],
    "faq": [
      {
        "q": "Does HK4016CT need a hardened shaft?",
        "a": "Either the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR35x40x17) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK4016CT needle roller bearing?",
        "a": "A HK4016CT drawn-cup needle roller bearing has a 40 mm shaft diameter (Fw, under-roller diameter), 47 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK4016CT drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4016CT, Fw = 40 mm, so the shaft must be machined to 40 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK4016CT needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK4016CT carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK4016CT",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK4020F",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 40,
    "D_mm": 47,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 25.9,
    "static_load_kN": 52.5,
    "fatigue_load_limit_kN": 6.4,
    "limiting_speed_rpm": 4000,
    "speed_oil_rpm": 6000,
    "weight_g": 52,
    "manufacturer_designation": "HK4020F",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK4020F",
      "HK4020F+IR35x40x20.5"
    ],
    "naming_rule_text": "As an open-end drawn-cup needle roller bearing in the HK-series (ISO 3245), NTN HK4020F is built around a thin hardened steel cup.Its printed envelope — 40 mm under-roller diameter, 47 mm outside diameter, 20 mm width — is fixed by ISO 3245; the 40 mm figure is the shaft journal itself, which carries the rollers directly. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. The F suffix marks NTN's caged drawn-cup execution: a formed steel cage spaces the rollers, lowering friction versus full-complement drawn cups. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.",
    "applications": [
      "printing press cylinder journals",
      "machine tool feed drive supports",
      "marine steering and linkage shafts",
      "lightly loaded high-speed idler positions where roller skidding must be watched"
    ],
    "failure_modes": [
      "cage wear or fracture from sustained operation near the limiting speed",
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat"
    ],
    "pitfalls": [
      "The press-fit of HK4020F at 40 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "The cage in HK4020F guides the rollers but is not a seal: it retains nothing against dust or washdown, so the housing still needs its own sealing arrangement at 40 mm.",
      "The 20 mm wide section of HK4020F gains rating through longer rollers at 40 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 40×47 mm narrow variant.",
      "The HK4020F drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK4020F needle roller bearing?",
        "a": "A HK4020F drawn-cup needle roller bearing has a 40 mm shaft diameter (Fw, under-roller diameter), 47 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK4020F drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4020F, Fw = 40 mm, so the shaft must be machined to 40 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK4020F needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK4020F carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK4020F need a hardened shaft?",
        "a": "Either the 40 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR35x40x20.5) so a standard unhardened shaft can be used."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK4020F",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK4516",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 45,
    "D_mm": 52,
    "B_mm": 16,
    "seal_type": "open",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 43,
    "fatigue_load_limit_kN": 5.25,
    "limiting_speed_rpm": 3700,
    "speed_oil_rpm": 5500,
    "weight_g": 46,
    "manufacturer_designation": "HK4516",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK4516",
      "HK4516+IR40x45x17"
    ],
    "naming_rule_text": "HK4516 is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 45 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 52 mm and the width is 16 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. Industrial sewing machines and textile equipment run this size on their shuttle and needle-bar drive shafts, where the compact radial section keeps the arm profile slim. Shaft tolerance for this size is h5 or j5: the roller complement needs a controlled radial clearance, and a shaft ground to general-purpose tolerances can leave the bearing either slack or pinched.",
    "applications": [
      "rolling mill auxiliary drives",
      "heavy gearbox and final drive shafts",
      "construction equipment swing pivots",
      "reciprocating or oscillating motion where the rollers never complete a full revolution"
    ],
    "failure_modes": [
      "raceway spalling on a shaft that was below the required 58–64 HRC hardness",
      "edge loading and needle skewing under shaft misalignment or deflection",
      "cage wear or fracture from sustained operation near the limiting speed"
    ],
    "pitfalls": [
      "With no suffix letters, HK4516 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 45×52×16 mm match exactly — suffix conventions for cage and shell variants differ between makers.",
      "The 16 mm standard width of HK4516 is the general-purpose section at 45 mm shaft; wider HK variants in the same 45×52 mm envelope carry more load and are not interchangeable if the housing width is fixed.",
      "The open ends of HK4516 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "The press-fit of HK4516 at 45 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row."
    ],
    "faq": [
      {
        "q": "What does Fw mean on a HK4516 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4516, Fw = 45 mm, so the shaft must be machined to 45 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK4516 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK4516 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK4516 need a hardened shaft?",
        "a": "Either the 45 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR40x45x17) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK4516 needle roller bearing?",
        "a": "A HK4516 drawn-cup needle roller bearing has a 45 mm shaft diameter (Fw, under-roller diameter), 52 mm outside diameter and 16 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK4516",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK4520",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 45,
    "D_mm": 52,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 27.6,
    "static_load_kN": 59,
    "fatigue_load_limit_kN": 7.2,
    "limiting_speed_rpm": 3700,
    "speed_oil_rpm": 5500,
    "weight_g": 58,
    "manufacturer_designation": "HK4520",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK4520",
      "HK4520+IR40x45x20.5"
    ],
    "naming_rule_text": "HK4520 is an NTN drawn-cup needle roller bearing with open ends in the HK-series (ISO 3245 boundary dimensions).The designation encodes the shaft fit directly: Fw = 45 mm is the under-roller diameter, i.e. the shaft journal that serves as the inner raceway; the cup outside diameter is 52 mm and the width is 20 mm. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. In this class the limiting factor is rarely the rating table — a poorly supported or out-of-round seat will end the bearing long before fatigue does. This cup size is common in power-tool intermediate shafts — drills, saws, grinders — where the gearbox casing is magnesium or aluminium and the cup is pressed into a steel insert. If the shaft sees axial float, allow for it in the housing width — the cup cannot guide the shaft axially, and a shaft that walks will eventually hammer the open end of the shell.",
    "applications": [
      "construction equipment swing pivots",
      "printing press cylinder journals",
      "machine tool feed drive supports",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "The 20 mm wide section of HK4520 gains rating through longer rollers at 45 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 45×52 mm narrow variant.",
      "Needle rollers tolerate almost no misalignment; if the 52 mm housing seat cannot be held square to the shaft, expect edge loading and early spalling.",
      "Press the drawn cup in with a mandrel bearing on the stamped face only — never hammer the cup or press through the rollers, that cracks or brinells the shell.",
      "Pressing HK4520 (45 mm shaft) home needs real force: keep the cup square with a guided mandrel, because a tilted cup overloads the roller row nearest the shoulder.",
      "With no suffix letters, HK4520 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 45×52×20 mm match exactly — suffix conventions for cage and shell variants differ between makers."
    ],
    "faq": [
      {
        "q": "Can a HK4520 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK4520 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK4520 need a hardened shaft?",
        "a": "Either the 45 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR40x45x20.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK4520 drawn-cup bearing?",
        "a": "HK4520 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (3700/5500 rpm) and radial load against the actual duty before finalizing."
      },
      {
        "q": "What are the dimensions of a HK4520 needle roller bearing?",
        "a": "A HK4520 drawn-cup needle roller bearing has a 45 mm shaft diameter (Fw, under-roller diameter), 52 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK4520 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK4520, Fw = 45 mm, so the shaft must be machined to 45 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK4520-2RS",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 45×52×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting."
      }
    ]
  },
  {
    "sku": "HK5020",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 50,
    "D_mm": 58,
    "B_mm": 20,
    "seal_type": "open",
    "dynamic_load_kN": 31.5,
    "static_load_kN": 63,
    "fatigue_load_limit_kN": 7.7,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 4800,
    "weight_g": 72,
    "manufacturer_designation": "HK5020",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK5020",
      "HK5020+IR40x50x22"
    ],
    "naming_rule_text": "NTN HK5020 belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 50 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 58 mm outside and 20 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. Larger drawn cups demand more of the housing: cast seats should be checked for roundness and rigidity before the cup is pressed in. This size is frequently specified in motorcycle gear-selector mechanisms, where the shaft is short, the housing is cast around the bearing, and the roller set must survive repeated shock from shift forks. Grease for this size should be a soft NLGI 1 or 2 lithium-complex grade: the open cup lets the housing supply the lubricant, and a stiff grease will not flow back through the roller set after standstill.",
    "applications": [
      "heavy gearbox and final drive shafts",
      "construction equipment swing pivots",
      "printing press cylinder journals",
      "dirty environments where the open ends rely entirely on the housing seals"
    ],
    "failure_modes": [
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends",
      "brinelling of the drawn cup from hammer blows during press-in mounting"
    ],
    "pitfalls": [
      "The 20 mm wide section of HK5020 gains rating through longer rollers at 50 mm shaft; confirm the housing width accepts 20 mm — it will not drop into a seat machined for the 50×58 mm narrow variant.",
      "The open ends of HK5020 retain no lubricant: grease must be supplied by the housing arrangement, and adjacent seals are needed in dirty or washdown duty.",
      "The press-fit of HK5020 at 50 mm shaft size must be done in one smooth stroke: stopping mid-way or driving at an angle leaves the cup cocked and the load on one roller row.",
      "With no suffix letters, HK5020 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 50×58×20 mm match exactly — suffix conventions for cage and shell variants differ between makers."
    ],
    "faq": [
      {
        "q": "Can a HK5020 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK5020 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK5020 need a hardened shaft?",
        "a": "Either the 50 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR40x50x22) so a standard unhardened shaft can be used."
      },
      {
        "q": "What are the dimensions of a HK5020 needle roller bearing?",
        "a": "A HK5020 drawn-cup needle roller bearing has a 50 mm shaft diameter (Fw, under-roller diameter), 58 mm outside diameter and 20 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK5020 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK5020, Fw = 50 mm, so the shaft must be machined to 50 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK5020",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "HK5025",
    "brand": "NTN",
    "series": "HK-series",
    "type": "needle",
    "d_mm": 50,
    "D_mm": 58,
    "B_mm": 25,
    "seal_type": "open",
    "dynamic_load_kN": 38.5,
    "static_load_kN": 82,
    "fatigue_load_limit_kN": 10,
    "limiting_speed_rpm": 3200,
    "speed_oil_rpm": 4800,
    "weight_g": 90,
    "manufacturer_designation": "HK5025",
    "standard": "ISO 3245",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "HK5025",
      "HK5025+IR45x50x25.5"
    ],
    "naming_rule_text": "NTN HK5025 belongs to the HK-series of open-end drawn-cup needle roller bearings (ISO 3245).Fw = 50 mm names the shaft journal that doubles as the inner raceway; around it the drawn cup measures 58 mm outside and 25 mm across. There is no separate inner ring — the thin-walled cup is drawn from sheet steel, hardened, and press-fitted into the housing, giving the smallest radial section of any rolling bearing at this shaft size. No suffix letters follow the size code: this is the basic caged drawn-cup execution in the HK range. At this shaft size the cup carries substantial radial load, but correct press-fit practice and housing rigidity become decisive for reaching the calculated life. You will find this cup size inside small two-stroke crankcases, supporting the small-end of the connecting rod where the housing is split and the bearing is pressed in before the case halves close. If the shaft cannot be hardened, press the matching IR inner ring onto it first; the ring gives the rollers a hardened, ground raceway and lets you keep a soft shaft for assembly reasons.",
    "applications": [
      "heavy gearbox and final drive shafts",
      "construction equipment swing pivots",
      "printing press cylinder journals",
      "continuous high-speed rotation where grease redistribution is the limiting factor"
    ],
    "failure_modes": [
      "cup cracking from an oval or tapered housing bore distorting the thin shell",
      "fretting of the cup outer surface in a soft or worn housing seat",
      "scoring of the needle rollers from abrasive contamination past the open ends"
    ],
    "pitfalls": [
      "At a 50 mm shaft diameter the press-in force for HK5025 is substantial; use a press with a guided mandrel and confirm the cup seats against the housing shoulder — a cocked cup concentrates load on the outermost roller row.",
      "With no suffix letters, HK5025 is the base caged execution: when replacing a branded equivalent, confirm the boundary dimensions 50×58×25 mm match exactly — suffix conventions for cage and shell variants differ between makers.",
      "The 25 mm extra-wide section of HK5025 (double-row or extended roller set) is the high-capacity option at 50 mm shaft; the wider cup is more sensitive to housing bore alignment, so check bore straightness over the full 25 mm width.",
      "Drawn-cup needle bearings carry radial load only: HK5025 provides no axial shaft location — use separate thrust washers or a locating bearing for axial forces.",
      "The HK5025 drawn cup is a thin shell that takes the shape of its housing: the housing bore must be machined to tolerance (typically N6/N7 for steel housings) — a worn or oval seat distorts the cup and cuts life."
    ],
    "faq": [
      {
        "q": "What are the dimensions of a HK5025 needle roller bearing?",
        "a": "A HK5025 drawn-cup needle roller bearing has a 50 mm shaft diameter (Fw, under-roller diameter), 58 mm outside diameter and 25 mm width, per ISO 3245 boundary dimensions. It has no inner ring — the shaft journal serves as the raceway."
      },
      {
        "q": "What does Fw mean on a HK5025 drawn-cup bearing?",
        "a": "Fw is the under-roller diameter — the diameter of the shaft journal on which the needle rollers run directly. For HK5025, Fw = 50 mm, so the shaft must be machined to 50 mm, hardened to 58–64 HRC and ground, unless a separate IR inner ring is fitted."
      },
      {
        "q": "Can a HK5025 needle roller bearing carry axial load?",
        "a": "No. Drawn-cup needle roller bearings like HK5025 carry radial load only and provide no axial shaft location. Axial forces must be carried by separate thrust washers or a locating bearing in the arrangement."
      },
      {
        "q": "Does HK5025 need a hardened shaft?",
        "a": "Either the 50 mm shaft journal must be hardened to 58–64 HRC and ground to Ra ≤ 0.2 µm, or you can fit the matching inner ring (IR45x50x25.5) so a standard unhardened shaft can be used."
      },
      {
        "q": "What duty conditions suit a HK5025 drawn-cup bearing?",
        "a": "HK5025 is typically specified for intermittent duty with long standstill periods that invite false brinelling; match the grease/oil speed limits (3200/4800 rpm) and radial load against the actual duty before finalizing."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "HK5025",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ]
  },
  {
    "sku": "UCP201",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 12,
    "D_mm": 32,
    "B_mm": 31,
    "seal_type": "2RS",
    "dynamic_load_kN": 14.2,
    "static_load_kN": 6.65,
    "fatigue_load_limit_kN": 0.505,
    "weight_g": 700,
    "housing_height_mm": 30.2,
    "base_length_mm": 127,
    "bolt_spacing_mm": 95,
    "bolt_size_mm": 13,
    "manufacturer_designation": "UCP201",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP201"
    ],
    "naming_rule_text": "The NTN UCP201 unit pairs a UC201D1 sealed ball bearing insert with a one-piece P203 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCP201 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 12 mm bore; the UC201D1 designation shows the D1 greasable execution. Boundary data for the 12 mm bore: housing centre height 30.2 mm, base 127 mm, mounting centres 95 mm for M10 fasteners through 13 mm holes; the UC201D1 insert itself is 32 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC201D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP201 weighs about 0.7 kg.",
    "applications": [
      "small packaging and labelling machines",
      "appliance and HVAC OEM drives",
      "food-table and bottle-line rollers",
      "frequent stop-start and reversing duty such as shuttle and tripper conveyors"
    ],
    "failure_modes": [
      "water-emulsified grease after washdown with the fitting facing upward",
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in",
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit"
    ],
    "pitfalls": [
      "The lip seals and slingers on UCP201 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.",
      "Never weld a bracket to the P203 housing of UCP201: local heat cracks cast iron and distorts the spherical bore that the insert depends on.",
      "At 12 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCP201, so check journal straightness before fitting.",
      "The standard 2-series insert in UCP201 is the lightest section at 12 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP201 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP201 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC201D1 insert uses two collar setscrews on the 12 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP201 instead of a flanged unit?",
        "a": "Choose the UCP201 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "Can I replace just the insert inside an UCP201 unit?",
        "a": "Yes — UCP201 is an assembly of the P203 housing and UC201D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 12 mm shaft are not the reason the old insert failed."
      },
      {
        "q": "What are the dimensions of an UCP201 mounted bearing?",
        "a": "UCP201 takes a 12 mm shaft (insert UC201D1, 32 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts."
      },
      {
        "q": "What does the UCP201 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 12 mm bore. UCP201 is built from housing P203 plus insert UC201D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP201",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP202",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 31,
    "seal_type": "2RS",
    "dynamic_load_kN": 14.2,
    "static_load_kN": 6.65,
    "fatigue_load_limit_kN": 0.505,
    "weight_g": 700,
    "housing_height_mm": 30.2,
    "base_length_mm": 127,
    "bolt_spacing_mm": 95,
    "bolt_size_mm": 13,
    "manufacturer_designation": "UCP202",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP202"
    ],
    "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP202 is the classic upright pillow block for a 15 mm shaft: insert UC202D1, housing P203, two foundation bolts. The UCP202 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 15 mm; P203 and UC202D1 are the separate housing and insert part numbers inside. Shaft size is 15 mm; the cast base stands 30.2 mm to the shaft centre (H), is 127 mm long overall (L), and the two foundation holes on 95 mm centres (J) clear 13 mm M10 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Small-bore mounted units like this are chosen mostly to eliminate bearing-housing design work on OEM machines built in the tens of units rather than for duty-cycle reasons. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC202D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP202 weighs about 0.7 kg.",
    "applications": [
      "appliance and HVAC OEM drives",
      "food-table and bottle-line rollers",
      "small fans and blowers",
      "low-speed heavily loaded pulleys where the static rating governs the selection"
    ],
    "failure_modes": [
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep",
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear",
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action"
    ],
    "pitfalls": [
      "The standard 2-series insert in UCP202 is the lightest section at 15 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP202 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area.",
      "When ordering covers for UCP202, note the steel and cast-iron cover executions change the unit mass and envelope but not the 95 mm mounting centres.",
      "UCP202 weighs little but its cast feet still crack on an uneven weldment; the 95 mm bolt centres must sit on a flat face, not bridge a weld bead."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCP202 mounted bearing?",
        "a": "UCP202 takes a 15 mm shaft (insert UC202D1, 35 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts."
      },
      {
        "q": "What does the UCP202 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 15 mm bore. UCP202 is built from housing P203 plus insert UC202D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP202 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC202D1 insert uses two collar setscrews on the 15 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP202 instead of a flanged unit?",
        "a": "Choose the UCP202 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP202",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP203",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 31,
    "seal_type": "2RS",
    "dynamic_load_kN": 14.2,
    "static_load_kN": 6.65,
    "fatigue_load_limit_kN": 0.505,
    "weight_g": 700,
    "housing_height_mm": 30.2,
    "base_length_mm": 127,
    "bolt_spacing_mm": 95,
    "bolt_size_mm": 13,
    "manufacturer_designation": "UCP203",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP203"
    ],
    "naming_rule_text": "NTN ships the UCP203 as a matched assembly — UC203D1 insert swaged into the P203 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 17 mm bore. Key mounting figures: centre height H = 30.2 mm, overall base length L = 127 mm, bolt-hole spacing J = 95 mm, and each of the two feet takes a 13 mm (M10) fastener for the 17 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC203D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP203 weighs about 0.7 kg.",
    "applications": [
      "food-table and bottle-line rollers",
      "small fans and blowers",
      "light agricultural augers",
      "cold-store and winter-outdoor service needing low-temperature grease"
    ],
    "failure_modes": [
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first",
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt",
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener"
    ],
    "pitfalls": [
      "Small units like UCP203 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 17 mm bore or the points strip out of the shaft.",
      "The standard 2-series insert in UCP203 is the lightest section at 17 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP203 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area.",
      "The D1 suffix on UC203D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP203 on site accepts relubrication.",
      "Self-aligning is not the same as free to move: the UC203D1 insert of UCP203 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat."
    ],
    "faq": [
      {
        "q": "Does UCP203 interchange with other brands at the same size?",
        "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 95 mm bolt centres of UCP203 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match."
      },
      {
        "q": "What are the dimensions of an UCP203 mounted bearing?",
        "a": "UCP203 takes a 17 mm shaft (insert UC203D1, 40 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts."
      },
      {
        "q": "What does the UCP203 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 17 mm bore. UCP203 is built from housing P203 plus insert UC203D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP203 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC203D1 insert uses two collar setscrews on the 17 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP203 instead of a flanged unit?",
        "a": "Choose the UCP203 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP203",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP204",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 31,
    "seal_type": "2RS",
    "dynamic_load_kN": 14.2,
    "static_load_kN": 6.65,
    "fatigue_load_limit_kN": 0.505,
    "weight_g": 700,
    "housing_height_mm": 33.3,
    "base_length_mm": 127,
    "bolt_spacing_mm": 95,
    "bolt_size_mm": 13,
    "manufacturer_designation": "UCP204",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP204"
    ],
    "naming_rule_text": "UCP204 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC204D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 20 mm shaft size; the unit is built from insert UC204D1 and housing P204. For layout work on UCP204: the 20 mm shaft centre sits 33.3 mm above the sole (H), the footprint is 127 mm long (L), bolt centres are 95 mm (J), and the foot holes suit M10 (13 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC204D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP204 weighs about 0.7 kg.",
    "applications": [
      "small fans and blowers",
      "light agricultural augers",
      "light belt and roller conveyors",
      "continuous one-direction running where creep risk concentrates on the setscrew points"
    ],
    "failure_modes": [
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in",
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit",
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip"
    ],
    "pitfalls": [
      "Never weld a bracket to the P204 housing of UCP204: local heat cracks cast iron and distorts the spherical bore that the insert depends on.",
      "At 20 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCP204, so check journal straightness before fitting.",
      "The standard 2-series insert in UCP204 is the lightest section at 20 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP204 needs a prepared horizontal surface at the 33.3 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP204 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC204D1 insert uses two collar setscrews on the 20 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP204 instead of a flanged unit?",
        "a": "Choose the UCP204 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 33.3 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCP204 mounted bearing?",
        "a": "UCP204 takes a 20 mm shaft (insert UC204D1, 47 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 33.3 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts."
      },
      {
        "q": "What does the UCP204 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 20 mm bore. UCP204 is built from housing P204 plus insert UC204D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP204",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP205",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 34.1,
    "seal_type": "2RS",
    "dynamic_load_kN": 15.5,
    "static_load_kN": 7.85,
    "fatigue_load_limit_kN": 0.55,
    "weight_g": 800,
    "housing_height_mm": 36.5,
    "base_length_mm": 140,
    "bolt_spacing_mm": 105,
    "bolt_size_mm": 13,
    "manufacturer_designation": "UCP205",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP205"
    ],
    "naming_rule_text": "A 25 mm bore upright mounted bearing, NTN UCP205 combines the UC205D1 self-aligning insert with the grey-iron P205 pillow block base. NTN's numbering ties the unit to its components: UCP205 means the P205 housing carrying the UC205D1 insert, with the last two digits denoting the 25 mm bore in the 2-series duty class. The foundation drawing needs four numbers: H 36.5 mm centre height, L 140 mm total length, J 105 mm between the 13 mm bolt holes, and a 25 mm shaft passing through the 52 mm OD insert. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UC205D1 insert are 15.5 kN dynamic and 7.85 kN static; the assembled UCP205 weighs about 0.8 kg.",
    "applications": [
      "machine-tool chip conveyors",
      "belt conveyor head, tail and bend pulleys",
      "industrial fans and blowers",
      "elevated-temperature positions where grease life, not bearing rating, sets the interval"
    ],
    "failure_modes": [
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear",
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action",
      "water-emulsified grease after washdown with the fitting facing upward"
    ],
    "pitfalls": [
      "As a pillow block, UCP205 needs a prepared horizontal surface at the 36.5 mm centre height: shim both feet with full-width packs so the 140 mm base seats over its full area.",
      "At replacement time, measure the 25 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCP205 creep identically to the old one.",
      "UCP205 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 25 mm journal over time.",
      "The standard section of UCP205 can look adequate at 25 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.",
      "The standard 2-series insert in UCP205 is the lightest section at 25 mm — do not substitute it into a position that previously ran an X or 3 unit: the 105 mm mounting may match while the load rating does not."
    ],
    "faq": [
      {
        "q": "What does the UCP205 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 25 mm bore. UCP205 is built from housing P205 plus insert UC205D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP205 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC205D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP205 instead of a flanged unit?",
        "a": "Choose the UCP205 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 36.5 mm above the 140 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "Is the UCP205 bearing self-aligning?",
        "a": "Yes within limits. The UC205D1 insert has a spherical outer diameter that pivots in the P205 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running."
      },
      {
        "q": "What are the dimensions of an UCP205 mounted bearing?",
        "a": "UCP205 takes a 25 mm shaft (insert UC205D1, 52 mm OD) and has a unit mass of about 0.8 kg. Housing figures: centre height H 36.5 mm, length L 140 mm, bolt centres J 105 mm, foot holes 13 mm for M10 bolts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP205",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX05",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 38.1,
    "seal_type": "2RS",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 11.3,
    "fatigue_load_limit_kN": 0.795,
    "weight_g": 1400,
    "housing_height_mm": 44.4,
    "base_length_mm": 159,
    "bolt_spacing_mm": 119,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCPX05",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX05"
    ],
    "naming_rule_text": "UCPX05 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UCX05D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series X, bore code ending in the 25 mm shaft size; the unit is built from insert UCX05D1 and housing PX05. For layout work on UCPX05: the 25 mm shaft centre sits 44.4 mm above the sole (H), the footprint is 159 mm long (L), bolt centres are 119 mm (J), and the foot holes suit M14 (17 mm) bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UCX05D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCPX05 weighs about 1.4 kg.",
    "applications": [
      "textile line-shafting",
      "machine-tool chip conveyors",
      "belt conveyor head, tail and bend pulleys",
      "fan drives where belt tension, not transmitted torque, sets the radial load"
    ],
    "failure_modes": [
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in",
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit",
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip"
    ],
    "pitfalls": [
      "Never weld a bracket to the PX05 housing of UCPX05: local heat cracks cast iron and distorts the spherical bore that the insert depends on.",
      "In this bore band the temptation is to choose UCPX05 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.",
      "The X insert of UCPX05 is wider and rated above the 2-series part at 25 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.",
      "As a pillow block, UCPX05 needs a prepared horizontal surface at the 44.4 mm centre height: shim both feet with full-width packs so the 159 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCPX05 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX05D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCPX05 instead of a flanged unit?",
        "a": "Choose the UCPX05 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 44.4 mm above the 159 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCPX05 mounted bearing?",
        "a": "UCPX05 takes a 25 mm shaft (insert UCX05D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 44.4 mm, length L 159 mm, bolt centres J 119 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCPX05 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 25 mm bore. UCPX05 is built from housing PX05 plus insert UCX05D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX05",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP305",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 38,
    "seal_type": "2RS",
    "dynamic_load_kN": 23.5,
    "static_load_kN": 10.9,
    "fatigue_load_limit_kN": 0.855,
    "weight_g": 1400,
    "housing_height_mm": 45,
    "base_length_mm": 175,
    "bolt_spacing_mm": 132,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP305",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP305"
    ],
    "naming_rule_text": "UCP305 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC305D1) pre-assembled in a P305 two-bolt plummer housing. On the nameplate, UCP305 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 25 mm bore; the UC305D1 designation shows the D1 greasable execution. Boundary data for the 25 mm bore: housing centre height 45 mm, base 175 mm, mounting centres 132 mm for M14 fasteners through 17 mm holes; the UC305D1 insert itself is 62 mm OD. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC305D1 insert are 23.5 kN dynamic and 10.9 kN static; the assembled UCP305 weighs about 1.4 kg.",
    "applications": [
      "belt conveyor head, tail and bend pulleys",
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "vibrating feeder and screen-adjacent positions where setscrew retorque is routine"
    ],
    "failure_modes": [
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt",
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener",
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep"
    ],
    "pitfalls": [
      "The 3-series insert makes UCP305 the highest-rated unit at 25 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP305 needs a prepared horizontal surface at the 45 mm centre height: shim both feet with full-width packs so the 175 mm base seats over its full area.",
      "Self-aligning is not the same as free to move: the UC305D1 insert of UCP305 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.",
      "In this bore band the temptation is to choose UCP305 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCP305 mounted bearing?",
        "a": "UCP305 takes a 25 mm shaft (insert UC305D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 45 mm, length L 175 mm, bolt centres J 132 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP305 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 25 mm bore. UCP305 is built from housing P305 plus insert UC305D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP305 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC305D1 insert uses two collar setscrews on the 25 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP305 instead of a flanged unit?",
        "a": "Choose the UCP305 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 45 mm above the 175 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP305",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP206",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 38.1,
    "seal_type": "2RS",
    "dynamic_load_kN": 21.6,
    "static_load_kN": 11.3,
    "fatigue_load_limit_kN": 0.795,
    "weight_g": 1400,
    "housing_height_mm": 42.9,
    "base_length_mm": 165,
    "bolt_spacing_mm": 121,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP206",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP206"
    ],
    "naming_rule_text": "UCP206 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC206D1) pre-assembled in a P206 two-bolt plummer housing. On the nameplate, UCP206 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 30 mm bore; the UC206D1 designation shows the D1 greasable execution. Boundary data for the 30 mm bore: housing centre height 42.9 mm, base 165 mm, mounting centres 121 mm for M14 fasteners through 17 mm holes; the UC206D1 insert itself is 62 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UC206D1 insert are 21.6 kN dynamic and 11.3 kN static; the assembled UCP206 weighs about 1.4 kg.",
    "applications": [
      "belt conveyor head, tail and bend pulleys",
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "washdown-duty food and pharmaceutical areas using purge relubrication"
    ],
    "failure_modes": [
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt",
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener",
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep"
    ],
    "pitfalls": [
      "The standard 2-series insert in UCP206 is the lightest section at 30 mm — do not substitute it into a position that previously ran an X or 3 unit: the 121 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP206 needs a prepared horizontal surface at the 42.9 mm centre height: shim both feet with full-width packs so the 165 mm base seats over its full area.",
      "Self-aligning is not the same as free to move: the UC206D1 insert of UCP206 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.",
      "With a 30 mm shaft the M14 foundation bolts of UCP206 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCP206 mounted bearing?",
        "a": "UCP206 takes a 30 mm shaft (insert UC206D1, 62 mm OD) and has a unit mass of about 1.4 kg. Housing figures: centre height H 42.9 mm, length L 165 mm, bolt centres J 121 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP206 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 30 mm bore. UCP206 is built from housing P206 plus insert UC206D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP206 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC206D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP206 instead of a flanged unit?",
        "a": "Choose the UCP206 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 42.9 mm above the 165 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP206",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX06",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 42.9,
    "seal_type": "2RS",
    "dynamic_load_kN": 28.4,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 1.09,
    "weight_g": 1800,
    "housing_height_mm": 47.6,
    "base_length_mm": 175,
    "bolt_spacing_mm": 127,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCPX06",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX06"
    ],
    "naming_rule_text": "A 30 mm bore upright mounted bearing, NTN UCPX06 combines the UCX06D1 self-aligning insert with the grey-iron PX06 pillow block base. NTN's numbering ties the unit to its components: UCPX06 means the PX06 housing carrying the UCX06D1 insert, with the last two digits denoting the 30 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 47.6 mm centre height, L 175 mm total length, J 127 mm between the 17 mm bolt holes, and a 30 mm shaft passing through the 72 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UCX06D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCPX06 weighs about 1.8 kg.",
    "applications": [
      "machine-tool chip conveyors",
      "belt conveyor head, tail and bend pulleys",
      "industrial fans and blowers",
      "frequent stop-start and reversing duty such as shuttle and tripper conveyors"
    ],
    "failure_modes": [
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear",
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action",
      "water-emulsified grease after washdown with the fitting facing upward"
    ],
    "pitfalls": [
      "As a pillow block, UCPX06 needs a prepared horizontal surface at the 47.6 mm centre height: shim both feet with full-width packs so the 175 mm base seats over its full area.",
      "At replacement time, measure the 30 mm shaft journal — a worn or deeply indented journal under the setscrews will let a brand-new UCPX06 creep identically to the old one.",
      "UCPX06 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 30 mm journal over time.",
      "The standard section of UCPX06 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.",
      "The X insert of UCPX06 is wider and rated above the 2-series part at 30 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping."
    ],
    "faq": [
      {
        "q": "What does the UCPX06 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 30 mm bore. UCPX06 is built from housing PX06 plus insert UCX06D1 (D1 = greasable)."
      },
      {
        "q": "How is UCPX06 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX06D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCPX06 instead of a flanged unit?",
        "a": "Choose the UCPX06 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 47.6 mm above the 175 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "Is the UCPX06 bearing self-aligning?",
        "a": "Yes within limits. The UCX06D1 insert has a spherical outer diameter that pivots in the PX06 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running."
      },
      {
        "q": "What are the dimensions of an UCPX06 mounted bearing?",
        "a": "UCPX06 takes a 30 mm shaft (insert UCX06D1, 72 mm OD) and has a unit mass of about 1.8 kg. Housing figures: centre height H 47.6 mm, length L 175 mm, bolt centres J 127 mm, foot holes 17 mm for M14 bolts."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX06",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP306",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 43,
    "seal_type": "2RS",
    "dynamic_load_kN": 29.5,
    "static_load_kN": 15,
    "fatigue_load_limit_kN": 1.14,
    "weight_g": 1800,
    "housing_height_mm": 50,
    "base_length_mm": 180,
    "bolt_spacing_mm": 140,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP306",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP306"
    ],
    "naming_rule_text": "The NTN UCP306 unit pairs a UC306D1 sealed ball bearing insert with a one-piece P306 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP306 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 30 mm; P306 and UC306D1 are the separate housing and insert part numbers inside. Shaft size is 30 mm; the cast base stands 50 mm to the shaft centre (H), is 180 mm long overall (L), and the two foundation holes on 140 mm centres (J) clear 17 mm M14 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Agricultural machinery — augers, stirrers, bucket elevators — uses this unit in the open, where the contact seals and slinger are the only barrier between the grease and chaff, dust and spray wash. The self-aligning capacity corrects only static misalignment of a few degrees; it does not forgive a bending shaft, which continuously pumps the outer ring and frets the spherical seat. Basic ratings of the UC306D1 insert are 29.5 kN dynamic and 15 kN static; the assembled UCP306 weighs about 1.8 kg.",
    "applications": [
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers"
    ],
    "failure_modes": [
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit",
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip",
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first"
    ],
    "pitfalls": [
      "When ordering covers for UCP306, note the steel and cast-iron cover executions change the unit mass and envelope but not the 140 mm mounting centres.",
      "The standard section of UCP306 can look adequate at 30 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.",
      "The 3-series insert makes UCP306 the highest-rated unit at 30 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP306 needs a prepared horizontal surface at the 50 mm centre height: shim both feet with full-width packs so the 180 mm base seats over its full area.",
      "Do not confuse UCP306 with a bare UC306D1 bearing: replacing only the insert is possible, but the housing P306 must be unworn and the spherical seat cleaned and coated with anti-seize."
    ],
    "faq": [
      {
        "q": "When should I choose a pillow block like UCP306 instead of a flanged unit?",
        "a": "Choose the UCP306 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 50 mm above the 180 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What loads can the UCP306 unit carry?",
        "a": "The UC306D1 insert is rated at 29.5 kN dynamic and 15 kN basic static (fatigue load limit 1.14 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately."
      },
      {
        "q": "What are the dimensions of an UCP306 mounted bearing?",
        "a": "UCP306 takes a 30 mm shaft (insert UC306D1, 72 mm OD) and has a unit mass of about 1.8 kg. Housing figures: centre height H 50 mm, length L 180 mm, bolt centres J 140 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP306 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 30 mm bore. UCP306 is built from housing P306 plus insert UC306D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP306 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC306D1 insert uses two collar setscrews on the 30 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP306",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP207",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 42.9,
    "seal_type": "2RS",
    "dynamic_load_kN": 28.4,
    "static_load_kN": 15.3,
    "fatigue_load_limit_kN": 1.09,
    "weight_g": 1600,
    "housing_height_mm": 47.6,
    "base_length_mm": 167,
    "bolt_spacing_mm": 127,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP207",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP207"
    ],
    "naming_rule_text": "The NTN UCP207 unit pairs a UC207D1 sealed ball bearing insert with a one-piece P207 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCP207 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 35 mm; P207 and UC207D1 are the separate housing and insert part numbers inside. Shaft size is 35 mm; the cast base stands 47.6 mm to the shaft centre (H), is 167 mm long overall (L), and the two foundation holes on 127 mm centres (J) clear 17 mm M14 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Quarry and aggregate conveyors specify this unit because maintenance crews can unbolt the whole assembly and swap it in minutes; interchangeability across brands at the JIS dimensions is part of the selection logic. Cold-climate users should order the low-temperature grease option or repack before commissioning: the factory fill is a general-purpose NLGI 2 that channels poorly below about −20 °C and starves the ball set on start-up. Basic ratings of the UC207D1 insert are 28.4 kN dynamic and 15.3 kN static; the assembled UCP207 weighs about 1.6 kg.",
    "applications": [
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "vibrating feeder and screen-adjacent positions where setscrew retorque is routine"
    ],
    "failure_modes": [
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit",
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip",
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first"
    ],
    "pitfalls": [
      "When ordering covers for UCP207, note the steel and cast-iron cover executions change the unit mass and envelope but not the 127 mm mounting centres.",
      "In this bore band the temptation is to choose UCP207 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.",
      "The standard 2-series insert in UCP207 is the lightest section at 35 mm — do not substitute it into a position that previously ran an X or 3 unit: the 127 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP207 needs a prepared horizontal surface at the 47.6 mm centre height: shim both feet with full-width packs so the 167 mm base seats over its full area.",
      "Do not confuse UCP207 with a bare UC207D1 bearing: replacing only the insert is possible, but the housing P207 must be unworn and the spherical seat cleaned and coated with anti-seize."
    ],
    "faq": [
      {
        "q": "When should I choose a pillow block like UCP207 instead of a flanged unit?",
        "a": "Choose the UCP207 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 47.6 mm above the 167 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What loads can the UCP207 unit carry?",
        "a": "The UC207D1 insert is rated at 28.4 kN dynamic and 15.3 kN basic static (fatigue load limit 1.09 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately."
      },
      {
        "q": "What are the dimensions of an UCP207 mounted bearing?",
        "a": "UCP207 takes a 35 mm shaft (insert UC207D1, 72 mm OD) and has a unit mass of about 1.6 kg. Housing figures: centre height H 47.6 mm, length L 167 mm, bolt centres J 127 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP207 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 35 mm bore. UCP207 is built from housing P207 plus insert UC207D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP207 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC207D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP207",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX07",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 49.2,
    "seal_type": "2RS",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 17.8,
    "fatigue_load_limit_kN": 1.24,
    "weight_g": 2400,
    "housing_height_mm": 54,
    "base_length_mm": 203,
    "bolt_spacing_mm": 144,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCPX07",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX07"
    ],
    "naming_rule_text": "UCPX07 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX07D1) pre-assembled in a PX07 two-bolt plummer housing. On the nameplate, UCPX07 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 35 mm bore; the UCX07D1 designation shows the D1 greasable execution. Boundary data for the 35 mm bore: housing centre height 54 mm, base 203 mm, mounting centres 144 mm for M14 fasteners through 17 mm holes; the UCX07D1 insert itself is 80 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UCX07D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCPX07 weighs about 2.4 kg.",
    "applications": [
      "belt conveyor head, tail and bend pulleys",
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "low-speed heavily loaded pulleys where the static rating governs the selection"
    ],
    "failure_modes": [
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt",
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener",
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep"
    ],
    "pitfalls": [
      "The X insert of UCPX07 is wider and rated above the 2-series part at 35 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.",
      "As a pillow block, UCPX07 needs a prepared horizontal surface at the 54 mm centre height: shim both feet with full-width packs so the 203 mm base seats over its full area.",
      "Self-aligning is not the same as free to move: the UCX07D1 insert of UCPX07 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.",
      "With a 35 mm shaft the M14 foundation bolts of UCPX07 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCPX07 mounted bearing?",
        "a": "UCPX07 takes a 35 mm shaft (insert UCX07D1, 80 mm OD) and has a unit mass of about 2.4 kg. Housing figures: centre height H 54 mm, length L 203 mm, bolt centres J 144 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCPX07 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 35 mm bore. UCPX07 is built from housing PX07 plus insert UCX07D1 (D1 = greasable)."
      },
      {
        "q": "How is UCPX07 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX07D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCPX07 instead of a flanged unit?",
        "a": "Choose the UCPX07 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 54 mm above the 203 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX07",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP307",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 48,
    "seal_type": "2RS",
    "dynamic_load_kN": 37,
    "static_load_kN": 19.1,
    "fatigue_load_limit_kN": 1.47,
    "weight_g": 2500,
    "housing_height_mm": 56,
    "base_length_mm": 210,
    "bolt_spacing_mm": 160,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP307",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP307"
    ],
    "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP307 is the classic upright pillow block for a 35 mm shaft: insert UC307D1, housing P307, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 35 mm bore. Key mounting figures: centre height H = 56 mm, overall base length L = 210 mm, bolt-hole spacing J = 160 mm, and each of the two feet takes a 17 mm (M14) fastener for the 35 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC307D1 insert are 37 kN dynamic and 19.1 kN static; the assembled UCP307 weighs about 2.5 kg.",
    "applications": [
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "textile line-shafting",
      "long line-shafting where several units must share a straight reference"
    ],
    "failure_modes": [
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action",
      "water-emulsified grease after washdown with the fitting facing upward",
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in"
    ],
    "pitfalls": [
      "UCP307 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 35 mm journal over time.",
      "With a 35 mm shaft the M14 foundation bolts of UCP307 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.",
      "The 3-series insert makes UCP307 the highest-rated unit at 35 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP307 needs a prepared horizontal surface at the 56 mm centre height: shim both feet with full-width packs so the 210 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP307 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC307D1 insert uses two collar setscrews on the 35 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP307 instead of a flanged unit?",
        "a": "Choose the UCP307 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 56 mm above the 210 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCP307 mounted bearing?",
        "a": "UCP307 takes a 35 mm shaft (insert UC307D1, 80 mm OD) and has a unit mass of about 2.5 kg. Housing figures: centre height H 56 mm, length L 210 mm, bolt centres J 160 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP307 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 35 mm bore. UCP307 is built from housing P307 plus insert UC307D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP307",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP208",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 49.2,
    "seal_type": "2RS",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 17.8,
    "fatigue_load_limit_kN": 1.24,
    "weight_g": 1900,
    "housing_height_mm": 49.2,
    "base_length_mm": 184,
    "bolt_spacing_mm": 137,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP208",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP208"
    ],
    "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP208 is the classic upright pillow block for a 40 mm shaft: insert UC208D1, housing P208, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 40 mm bore. Key mounting figures: centre height H = 49.2 mm, overall base length L = 184 mm, bolt-hole spacing J = 137 mm, and each of the two feet takes a 17 mm (M14) fastener for the 40 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC208D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCP208 weighs about 1.9 kg.",
    "applications": [
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "textile line-shafting",
      "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers"
    ],
    "failure_modes": [
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action",
      "water-emulsified grease after washdown with the fitting facing upward",
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in"
    ],
    "pitfalls": [
      "UCP208 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 40 mm journal over time.",
      "The standard section of UCP208 can look adequate at 40 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.",
      "The standard 2-series insert in UCP208 is the lightest section at 40 mm — do not substitute it into a position that previously ran an X or 3 unit: the 137 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP208 needs a prepared horizontal surface at the 49.2 mm centre height: shim both feet with full-width packs so the 184 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP208 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC208D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP208 instead of a flanged unit?",
        "a": "Choose the UCP208 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 49.2 mm above the 184 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCP208 mounted bearing?",
        "a": "UCP208 takes a 40 mm shaft (insert UC208D1, 80 mm OD) and has a unit mass of about 1.9 kg. Housing figures: centre height H 49.2 mm, length L 184 mm, bolt centres J 137 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP208 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 40 mm bore. UCP208 is built from housing P208 plus insert UC208D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP208",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX08",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 49.2,
    "seal_type": "2RS",
    "dynamic_load_kN": 36,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 1.6,
    "weight_g": 2900,
    "housing_height_mm": 58.7,
    "base_length_mm": 222,
    "bolt_spacing_mm": 156,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCPX08",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX08"
    ],
    "naming_rule_text": "The NTN UCPX08 unit pairs a UCX08D1 sealed ball bearing insert with a one-piece PX08 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. The UCPX08 number follows NTN's mounted-unit convention: housing letter P, X-series section, bore code for 40 mm; PX08 and UCX08D1 are the separate housing and insert part numbers inside. Shaft size is 40 mm; the cast base stands 58.7 mm to the shaft centre (H), is 222 mm long overall (L), and the two foundation holes on 156 mm centres (J) clear 20 mm M16 bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Lumber-yard and planer-mill equipment fits this unit where bark chips and planer shavings rain on the housing; the slinger flings particles away before they reach the lip seal. When fitting a steel or cast-iron end cover, torque its cap screws lightly in sequence — the cover locates the grease, it is not a bearing shoulder, and a warped cover drags on the rotating inner ring. Basic ratings of the UCX08D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCPX08 weighs about 2.9 kg.",
    "applications": [
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "cold-store and winter-outdoor service needing low-temperature grease"
    ],
    "failure_modes": [
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit",
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip",
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first"
    ],
    "pitfalls": [
      "When ordering covers for UCPX08, note the steel and cast-iron cover executions change the unit mass and envelope but not the 156 mm mounting centres.",
      "In this bore band the temptation is to choose UCPX08 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.",
      "The X insert of UCPX08 is wider and rated above the 2-series part at 40 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.",
      "As a pillow block, UCPX08 needs a prepared horizontal surface at the 58.7 mm centre height: shim both feet with full-width packs so the 222 mm base seats over its full area.",
      "Do not confuse UCPX08 with a bare UCX08D1 bearing: replacing only the insert is possible, but the housing PX08 must be unworn and the spherical seat cleaned and coated with anti-seize."
    ],
    "faq": [
      {
        "q": "When should I choose a pillow block like UCPX08 instead of a flanged unit?",
        "a": "Choose the UCPX08 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 58.7 mm above the 222 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What loads can the UCPX08 unit carry?",
        "a": "The UCX08D1 insert is rated at 36 kN dynamic and 20.4 kN basic static (fatigue load limit 1.6 kN). Mounted units are predominantly selected on radial load from belt pull and overhung weight; axial capacity is limited and should be checked separately."
      },
      {
        "q": "What are the dimensions of an UCPX08 mounted bearing?",
        "a": "UCPX08 takes a 40 mm shaft (insert UCX08D1, 90 mm OD) and has a unit mass of about 2.9 kg. Housing figures: centre height H 58.7 mm, length L 222 mm, bolt centres J 156 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCPX08 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 40 mm bore. UCPX08 is built from housing PX08 plus insert UCX08D1 (D1 = greasable)."
      },
      {
        "q": "How is UCPX08 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX08D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX08",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP308",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 52,
    "seal_type": "2RS",
    "dynamic_load_kN": 45,
    "static_load_kN": 24,
    "fatigue_load_limit_kN": 1.83,
    "weight_g": 3000,
    "housing_height_mm": 60,
    "base_length_mm": 220,
    "bolt_spacing_mm": 170,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP308",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP308"
    ],
    "naming_rule_text": "NTN ships the UCP308 as a matched assembly — UC308D1 insert swaged into the P308 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 40 mm shaft size; the unit is built from insert UC308D1 and housing P308. For layout work on UCP308: the 40 mm shaft centre sits 60 mm above the sole (H), the footprint is 220 mm long (L), bolt centres are 170 mm (J), and the foot holes suit M14 (17 mm) bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC308D1 insert are 45 kN dynamic and 24 kN static; the assembled UCP308 weighs about 3.0 kg.",
    "applications": [
      "small crushers and screening feeds",
      "textile line-shafting",
      "machine-tool chip conveyors",
      "fan drives where belt tension, not transmitted torque, sets the radial load"
    ],
    "failure_modes": [
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener",
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep",
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear"
    ],
    "pitfalls": [
      "The 3-series insert makes UCP308 the highest-rated unit at 40 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP308 needs a prepared horizontal surface at the 60 mm centre height: shim both feet with full-width packs so the 220 mm base seats over its full area.",
      "The lip seals and slingers on UCP308 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.",
      "Never weld a bracket to the P308 housing of UCP308: local heat cracks cast iron and distorts the spherical bore that the insert depends on.",
      "In this bore band the temptation is to choose UCP308 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCP308 mounted bearing?",
        "a": "UCP308 takes a 40 mm shaft (insert UC308D1, 90 mm OD) and has a unit mass of about 3.0 kg. Housing figures: centre height H 60 mm, length L 220 mm, bolt centres J 170 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP308 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 40 mm bore. UCP308 is built from housing P308 plus insert UC308D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP308 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC308D1 insert uses two collar setscrews on the 40 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP308 instead of a flanged unit?",
        "a": "Choose the UCP308 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 60 mm above the 220 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "How often should I relubricate an UCP308 unit?",
        "a": "There is no single interval for UCP308: the UC308D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP308",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP209",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 49.2,
    "seal_type": "2RS",
    "dynamic_load_kN": 36,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 1.6,
    "weight_g": 2200,
    "housing_height_mm": 54,
    "base_length_mm": 190,
    "bolt_spacing_mm": 146,
    "bolt_size_mm": 17,
    "manufacturer_designation": "UCP209",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP209"
    ],
    "naming_rule_text": "NTN ships the UCP209 as a matched assembly — UC209D1 insert swaged into the P209 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 2, bore code ending in the 45 mm shaft size; the unit is built from insert UC209D1 and housing P209. For layout work on UCP209: the 45 mm shaft centre sits 54 mm above the sole (H), the footprint is 190 mm long (L), bolt centres are 146 mm (J), and the foot holes suit M14 (17 mm) bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. On machine-tool ancillary drives — chip conveyors, coolant pumps, rotary feeders — this unit is chosen because the spherical fit tolerates a frame welded without precision fixtures. The spherical outer diameter of the insert must be free to pivot in the housing bore during alignment; never pin the insert or weld the housing before the shaft has been turned through several revolutions and the alignment set. Basic ratings of the UC209D1 insert are 36 kN dynamic and 20.4 kN static; the assembled UCP209 weighs about 2.2 kg.",
    "applications": [
      "small crushers and screening feeds",
      "textile line-shafting",
      "machine-tool chip conveyors",
      "long line-shafting where several units must share a straight reference"
    ],
    "failure_modes": [
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener",
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep",
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear"
    ],
    "pitfalls": [
      "The standard 2-series insert in UCP209 is the lightest section at 45 mm — do not substitute it into a position that previously ran an X or 3 unit: the 146 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP209 needs a prepared horizontal surface at the 54 mm centre height: shim both feet with full-width packs so the 190 mm base seats over its full area.",
      "The lip seals and slingers on UCP209 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.",
      "Never weld a bracket to the P209 housing of UCP209: local heat cracks cast iron and distorts the spherical bore that the insert depends on.",
      "With a 45 mm shaft the M14 foundation bolts of UCP209 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCP209 mounted bearing?",
        "a": "UCP209 takes a 45 mm shaft (insert UC209D1, 85 mm OD) and has a unit mass of about 2.2 kg. Housing figures: centre height H 54 mm, length L 190 mm, bolt centres J 146 mm, foot holes 17 mm for M14 bolts."
      },
      {
        "q": "What does the UCP209 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 45 mm bore. UCP209 is built from housing P209 plus insert UC209D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP209 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC209D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP209 instead of a flanged unit?",
        "a": "Choose the UCP209 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 54 mm above the 190 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "How often should I relubricate an UCP209 unit?",
        "a": "There is no single interval for UCP209: the UC209D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP209",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX09",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 51.6,
    "seal_type": "2RS",
    "dynamic_load_kN": 39,
    "static_load_kN": 23.2,
    "fatigue_load_limit_kN": 1.82,
    "weight_g": 3200,
    "housing_height_mm": 58.7,
    "base_length_mm": 222,
    "bolt_spacing_mm": 156,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCPX09",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX09"
    ],
    "naming_rule_text": "In NTN's mounted-ball-bearing range, UCPX09 is the classic upright pillow block for a 45 mm shaft: insert UCX09D1, housing PX09, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the X code identifies the duty series and the final two digits encode the 45 mm bore. Key mounting figures: centre height H = 58.7 mm, overall base length L = 222 mm, bolt-hole spacing J = 156 mm, and each of the two feet takes a 20 mm (M16) fastener for the 45 mm shaft. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Cement-block and brick plants mount this size on mixer and feeder drives in abrasive dust; the optional cast-iron closing covers are fitted more often here than in any other industry. On a horizontal shaft fill the housing cavity to roughly one third; packed-full housings churn the grease, run hot and destroy the thickener long before the base oil oxidises. Basic ratings of the UCX09D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCPX09 weighs about 3.2 kg.",
    "applications": [
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "textile line-shafting",
      "continuous one-direction running where creep risk concentrates on the setscrew points"
    ],
    "failure_modes": [
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action",
      "water-emulsified grease after washdown with the fitting facing upward",
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in"
    ],
    "pitfalls": [
      "UCPX09 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 45 mm journal over time.",
      "The standard section of UCPX09 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.",
      "The X insert of UCPX09 is wider and rated above the 2-series part at 45 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.",
      "As a pillow block, UCPX09 needs a prepared horizontal surface at the 58.7 mm centre height: shim both feet with full-width packs so the 222 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCPX09 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX09D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCPX09 instead of a flanged unit?",
        "a": "Choose the UCPX09 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 58.7 mm above the 222 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCPX09 mounted bearing?",
        "a": "UCPX09 takes a 45 mm shaft (insert UCX09D1, 100 mm OD) and has a unit mass of about 3.2 kg. Housing figures: centre height H 58.7 mm, length L 222 mm, bolt centres J 156 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCPX09 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 45 mm bore. UCPX09 is built from housing PX09 plus insert UCX09D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX09",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP309",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 57,
    "seal_type": "2RS",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 32,
    "fatigue_load_limit_kN": 2.5,
    "weight_g": 4100,
    "housing_height_mm": 67,
    "base_length_mm": 245,
    "bolt_spacing_mm": 190,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCP309",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP309"
    ],
    "naming_rule_text": "UCP309 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UC309D1 insert. NTN's numbering ties the unit to its components: UCP309 means the P309 housing carrying the UC309D1 insert, with the last two digits denoting the 45 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 67 mm centre height, L 245 mm total length, J 190 mm between the 20 mm bolt holes, and a 45 mm shaft passing through the 100 mm OD insert. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC309D1 insert are 58.5 kN dynamic and 32 kN static; the assembled UCP309 weighs about 4.1 kg.",
    "applications": [
      "textile line-shafting",
      "machine-tool chip conveyors",
      "belt conveyor head, tail and bend pulleys",
      "frequent stop-start and reversing duty such as shuttle and tripper conveyors"
    ],
    "failure_modes": [
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip",
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first",
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt"
    ],
    "pitfalls": [
      "The 3-series insert makes UCP309 the highest-rated unit at 45 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP309 needs a prepared horizontal surface at the 67 mm centre height: shim both feet with full-width packs so the 245 mm base seats over its full area.",
      "When ordering covers for UCP309, note the steel and cast-iron cover executions change the unit mass and envelope but not the 190 mm mounting centres.",
      "The standard section of UCP309 can look adequate at 45 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCP309 mounted bearing?",
        "a": "UCP309 takes a 45 mm shaft (insert UC309D1, 100 mm OD) and has a unit mass of about 4.1 kg. Housing figures: centre height H 67 mm, length L 245 mm, bolt centres J 190 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCP309 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 45 mm bore. UCP309 is built from housing P309 plus insert UC309D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP309 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC309D1 insert uses two collar setscrews on the 45 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP309 instead of a flanged unit?",
        "a": "Choose the UCP309 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 67 mm above the 245 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP309",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP210",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 51.6,
    "seal_type": "2RS",
    "dynamic_load_kN": 39,
    "static_load_kN": 23.2,
    "fatigue_load_limit_kN": 1.82,
    "weight_g": 2700,
    "housing_height_mm": 57.2,
    "base_length_mm": 206,
    "bolt_spacing_mm": 159,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCP210",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP210"
    ],
    "naming_rule_text": "The NTN UCP210 unit pairs a UC210D1 sealed ball bearing insert with a one-piece P210 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCP210 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 50 mm bore; the UC210D1 designation shows the D1 greasable execution. Boundary data for the 50 mm bore: housing centre height 57.2 mm, base 206 mm, mounting centres 159 mm for M16 fasteners through 20 mm holes; the UC210D1 insert itself is 90 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. The 25–50 mm bore band is the workhorse of industry — belt conveyors, fans, agricultural drives and small process machines — which is why this range has the fullest choice of series and cover options. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC210D1 insert are 39 kN dynamic and 23.2 kN static; the assembled UCP210 weighs about 2.7 kg.",
    "applications": [
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "vibrating feeder and screen-adjacent positions where setscrew retorque is routine"
    ],
    "failure_modes": [
      "water-emulsified grease after washdown with the fitting facing upward",
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in",
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit"
    ],
    "pitfalls": [
      "Do not confuse UCP210 with a bare UC210D1 bearing: replacing only the insert is possible, but the housing P210 must be unworn and the spherical seat cleaned and coated with anti-seize.",
      "When ordering covers for UCP210, note the steel and cast-iron cover executions change the unit mass and envelope but not the 159 mm mounting centres.",
      "In this bore band the temptation is to choose UCP210 on shaft size alone; belt pull often dominates the radial load, so rate the unit against the overhung pulley force, not just transmitted power.",
      "The standard 2-series insert in UCP210 is the lightest section at 50 mm — do not substitute it into a position that previously ran an X or 3 unit: the 159 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP210 needs a prepared horizontal surface at the 57.2 mm centre height: shim both feet with full-width packs so the 206 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP210 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC210D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP210 instead of a flanged unit?",
        "a": "Choose the UCP210 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 57.2 mm above the 206 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "Can I replace just the insert inside an UCP210 unit?",
        "a": "Yes — UCP210 is an assembly of the P210 housing and UC210D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 50 mm shaft are not the reason the old insert failed."
      },
      {
        "q": "What are the dimensions of an UCP210 mounted bearing?",
        "a": "UCP210 takes a 50 mm shaft (insert UC210D1, 90 mm OD) and has a unit mass of about 2.7 kg. Housing figures: centre height H 57.2 mm, length L 206 mm, bolt centres J 159 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCP210 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 50 mm bore. UCP210 is built from housing P210 plus insert UC210D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP210",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX10",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 55.6,
    "seal_type": "2RS",
    "dynamic_load_kN": 48,
    "static_load_kN": 29.2,
    "fatigue_load_limit_kN": 2.29,
    "weight_g": 4100,
    "housing_height_mm": 63.5,
    "base_length_mm": 241,
    "bolt_spacing_mm": 171,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCPX10",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX10"
    ],
    "naming_rule_text": "UCPX10 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UCX10D1) pre-assembled in a PX10 two-bolt plummer housing. NTN's numbering ties the unit to its components: UCPX10 means the PX10 housing carrying the UCX10D1 insert, with the last two digits denoting the 50 mm bore in the X-series duty class. The foundation drawing needs four numbers: H 63.5 mm centre height, L 241 mm total length, J 171 mm between the 20 mm bolt holes, and a 50 mm shaft passing through the 110 mm OD insert. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UCX10D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCPX10 weighs about 4.1 kg.",
    "applications": [
      "belt conveyor head, tail and bend pulleys",
      "industrial fans and blowers",
      "agricultural augers and bucket elevators",
      "low-speed heavily loaded pulleys where the static rating governs the selection"
    ],
    "failure_modes": [
      "over-greasing that churns the charge, overheats the bearing and blows the seal lip",
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first",
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt"
    ],
    "pitfalls": [
      "The X insert of UCPX10 is wider and rated above the 2-series part at 50 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.",
      "As a pillow block, UCPX10 needs a prepared horizontal surface at the 63.5 mm centre height: shim both feet with full-width packs so the 241 mm base seats over its full area.",
      "Self-aligning is not the same as free to move: the UCX10D1 insert of UCPX10 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.",
      "With a 50 mm shaft the M16 foundation bolts of UCPX10 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews."
    ],
    "faq": [
      {
        "q": "What are the dimensions of an UCPX10 mounted bearing?",
        "a": "UCPX10 takes a 50 mm shaft (insert UCX10D1, 110 mm OD) and has a unit mass of about 4.1 kg. Housing figures: centre height H 63.5 mm, length L 241 mm, bolt centres J 171 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCPX10 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 50 mm bore. UCPX10 is built from housing PX10 plus insert UCX10D1 (D1 = greasable)."
      },
      {
        "q": "How is UCPX10 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX10D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCPX10 instead of a flanged unit?",
        "a": "Choose the UCPX10 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 63.5 mm above the 241 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX10",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP310",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 61,
    "seal_type": "2RS",
    "dynamic_load_kN": 68.5,
    "static_load_kN": 38.5,
    "fatigue_load_limit_kN": 2.99,
    "weight_g": 5600,
    "housing_height_mm": 75,
    "base_length_mm": 275,
    "bolt_spacing_mm": 212,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCP310",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP310"
    ],
    "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP310 is the classic upright pillow block for a 50 mm shaft: insert UC310D1, housing P310, two foundation bolts. The UCP310 number follows NTN's mounted-unit convention: housing letter P, 3-series section, bore code for 50 mm; P310 and UC310D1 are the separate housing and insert part numbers inside. Shaft size is 50 mm; the cast base stands 75 mm to the shaft centre (H), is 275 mm long overall (L), and the two foundation holes on 212 mm centres (J) clear 20 mm M16 bolts. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Most general industrial shafting in the 25–50 mm range ends up on exactly this class of unit: designers trade the 2, X and 3 sections against conveyor centres and belt tension rather than against absolute capacity. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC310D1 insert are 68.5 kN dynamic and 38.5 kN static; the assembled UCP310 weighs about 5.6 kg.",
    "applications": [
      "agricultural augers and bucket elevators",
      "small crushers and screening feeds",
      "textile line-shafting",
      "long line-shafting where several units must share a straight reference"
    ],
    "failure_modes": [
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep",
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear",
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action"
    ],
    "pitfalls": [
      "UCP310 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 50 mm journal over time.",
      "With a 50 mm shaft the M16 foundation bolts of UCP310 must be re-checked after run-in — paint crush under the feet is enough to loosen both the feet and the setscrews.",
      "The 3-series insert makes UCP310 the highest-rated unit at 50 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP310 needs a prepared horizontal surface at the 75 mm centre height: shim both feet with full-width packs so the 275 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP310 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC310D1 insert uses two collar setscrews on the 50 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP310 instead of a flanged unit?",
        "a": "Choose the UCP310 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 75 mm above the 275 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCP310 mounted bearing?",
        "a": "UCP310 takes a 50 mm shaft (insert UC310D1, 110 mm OD) and has a unit mass of about 5.6 kg. Housing figures: centre height H 75 mm, length L 275 mm, bolt centres J 212 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCP310 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 50 mm bore. UCP310 is built from housing P310 plus insert UC310D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP310",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP211",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 55.6,
    "seal_type": "2RS",
    "dynamic_load_kN": 48,
    "static_load_kN": 29.2,
    "fatigue_load_limit_kN": 2.29,
    "weight_g": 3400,
    "housing_height_mm": 63.5,
    "base_length_mm": 219,
    "bolt_spacing_mm": 171,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCP211",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP211"
    ],
    "naming_rule_text": "In NTN's mounted-ball-bearing range, UCP211 is the classic upright pillow block for a 55 mm shaft: insert UC211D1, housing P211, two foundation bolts. The UCP211 number follows NTN's mounted-unit convention: housing letter P, 2-series section, bore code for 55 mm; P211 and UC211D1 are the separate housing and insert part numbers inside. Shaft size is 55 mm; the cast base stands 63.5 mm to the shaft centre (H), is 219 mm long overall (L), and the two foundation holes on 171 mm centres (J) clear 20 mm M16 bolts. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC211D1 insert are 48 kN dynamic and 29.2 kN static; the assembled UCP211 weighs about 3.4 kg.",
    "applications": [
      "quarry feeder and transfer drives",
      "sawmill arbors and feed rolls",
      "cement and clinker handling",
      "wet, abrasive or chemically aggressive environments relying on the lip seals and slingers"
    ],
    "failure_modes": [
      "fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep",
      "lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear",
      "spherical-seat fretting that welds insert to housing and destroys the self-aligning action"
    ],
    "pitfalls": [
      "UCP211 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 55 mm journal over time.",
      "UCP211 at 55 mm uses M16 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 63.5 mm centre height and binds the insert.",
      "The standard 2-series insert in UCP211 is the lightest section at 55 mm — do not substitute it into a position that previously ran an X or 3 unit: the 171 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP211 needs a prepared horizontal surface at the 63.5 mm centre height: shim both feet with full-width packs so the 219 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCP211 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC211D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP211 instead of a flanged unit?",
        "a": "Choose the UCP211 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 63.5 mm above the 219 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "What are the dimensions of an UCP211 mounted bearing?",
        "a": "UCP211 takes a 55 mm shaft (insert UC211D1, 100 mm OD) and has a unit mass of about 3.4 kg. Housing figures: centre height H 63.5 mm, length L 219 mm, bolt centres J 171 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCP211 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 55 mm bore. UCP211 is built from housing P211 plus insert UC211D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP211",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCPX11",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 65.1,
    "seal_type": "2RS",
    "dynamic_load_kN": 58,
    "static_load_kN": 36,
    "fatigue_load_limit_kN": 2.83,
    "weight_g": 5400,
    "housing_height_mm": 69.8,
    "base_length_mm": 260,
    "bolt_spacing_mm": 184,
    "bolt_size_mm": 25,
    "manufacturer_designation": "UCPX11",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCPX11"
    ],
    "naming_rule_text": "The NTN UCPX11 unit pairs a UCX11D1 sealed ball bearing insert with a one-piece PX11 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCPX11 decodes as a UC wide-inner-ring insert in a P plummer block, X-series duty, 55 mm bore; the UCX11D1 designation shows the D1 greasable execution. Boundary data for the 55 mm bore: housing centre height 69.8 mm, base 260 mm, mounting centres 184 mm for M20 fasteners through 25 mm holes; the UCX11D1 insert itself is 120 mm OD. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UCX11D1 insert are 58 kN dynamic and 36 kN static; the assembled UCPX11 weighs about 5.4 kg.",
    "applications": [
      "process fans and induced-draft drives",
      "quarry feeder and transfer drives",
      "sawmill arbors and feed rolls",
      "cold-store and winter-outdoor service needing low-temperature grease"
    ],
    "failure_modes": [
      "water-emulsified grease after washdown with the fitting facing upward",
      "setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in",
      "insert brinelling from hammer mounting or from belt tension applied to a stationary unit"
    ],
    "pitfalls": [
      "Do not confuse UCPX11 with a bare UCX11D1 bearing: replacing only the insert is possible, but the housing PX11 must be unworn and the spherical seat cleaned and coated with anti-seize.",
      "When ordering covers for UCPX11, note the steel and cast-iron cover executions change the unit mass and envelope but not the 184 mm mounting centres.",
      "At 55 mm bore the 260 mm base of UCPX11 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.",
      "The X insert of UCPX11 is wider and rated above the 2-series part at 55 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.",
      "As a pillow block, UCPX11 needs a prepared horizontal surface at the 69.8 mm centre height: shim both feet with full-width packs so the 260 mm base seats over its full area."
    ],
    "faq": [
      {
        "q": "How is UCPX11 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UCX11D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCPX11 instead of a flanged unit?",
        "a": "Choose the UCPX11 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 69.8 mm above the 260 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      },
      {
        "q": "Can I replace just the insert inside an UCPX11 unit?",
        "a": "Yes — UCPX11 is an assembly of the PX11 housing and UCX11D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 55 mm shaft are not the reason the old insert failed."
      },
      {
        "q": "What are the dimensions of an UCPX11 mounted bearing?",
        "a": "UCPX11 takes a 55 mm shaft (insert UCX11D1, 120 mm OD) and has a unit mass of about 5.4 kg. Housing figures: centre height H 69.8 mm, length L 260 mm, bolt centres J 184 mm, foot holes 25 mm for M20 bolts."
      },
      {
        "q": "What does the UCPX11 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 55 mm bore. UCPX11 is built from housing PX11 plus insert UCX11D1 (D1 = greasable)."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCPX11",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP311",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 66,
    "seal_type": "2RS",
    "dynamic_load_kN": 79.5,
    "static_load_kN": 45,
    "fatigue_load_limit_kN": 3.5,
    "weight_g": 7300,
    "housing_height_mm": 80,
    "base_length_mm": 310,
    "bolt_spacing_mm": 236,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCP311",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP311"
    ],
    "naming_rule_text": "NTN ships the UCP311 as a matched assembly — UC311D1 insert swaged into the P311 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 3 code identifies the duty series and the final two digits encode the 55 mm bore. Key mounting figures: centre height H = 80 mm, overall base length L = 310 mm, bolt-hole spacing J = 236 mm, and each of the two feet takes a 20 mm (M16) fastener for the 55 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC311D1 insert are 79.5 kN dynamic and 45 kN static; the assembled UCP311 weighs about 7.3 kg.",
    "applications": [
      "sawmill arbors and feed rolls",
      "cement and clinker handling",
      "sugar-mill and fertiliser plant drives",
      "fan drives where belt tension, not transmitted torque, sets the radial load"
    ],
    "failure_modes": [
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first",
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt",
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener"
    ],
    "pitfalls": [
      "At 55 mm bore the 310 mm base of UCP311 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.",
      "The 3-series insert makes UCP311 the highest-rated unit at 55 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.",
      "As a pillow block, UCP311 needs a prepared horizontal surface at the 80 mm centre height: shim both feet with full-width packs so the 310 mm base seats over its full area.",
      "The lip seals and slingers on UCP311 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.",
      "Never weld a bracket to the P311 housing of UCP311: local heat cracks cast iron and distorts the spherical bore that the insert depends on."
    ],
    "faq": [
      {
        "q": "Does UCP311 interchange with other brands at the same size?",
        "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 236 mm bolt centres of UCP311 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match."
      },
      {
        "q": "What are the dimensions of an UCP311 mounted bearing?",
        "a": "UCP311 takes a 55 mm shaft (insert UC311D1, 120 mm OD) and has a unit mass of about 7.3 kg. Housing figures: centre height H 80 mm, length L 310 mm, bolt centres J 236 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCP311 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 55 mm bore. UCP311 is built from housing P311 plus insert UC311D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP311 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC311D1 insert uses two collar setscrews on the 55 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP311 instead of a flanged unit?",
        "a": "Choose the UCP311 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 80 mm above the 310 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP311",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  },
  {
    "sku": "UCP212",
    "brand": "NTN",
    "series": "UCP-series",
    "type": "pillow_block",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 65.1,
    "seal_type": "2RS",
    "dynamic_load_kN": 58,
    "static_load_kN": 36,
    "fatigue_load_limit_kN": 2.83,
    "weight_g": 4700,
    "housing_height_mm": 69.8,
    "base_length_mm": 241,
    "bolt_spacing_mm": 184,
    "bolt_size_mm": 20,
    "manufacturer_designation": "UCP212",
    "standard": "JIS B 1559",
    "source_ref": "https://www.ntnglobal.com/",
    "catalog_ver": "CAT. No. 2203-3/E 2024",
    "extracted_at": "2026-09-25",
    "aliases": [
      "UCP212"
    ],
    "naming_rule_text": "NTN ships the UCP212 as a matched assembly — UC212D1 insert swaged into the P212 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 60 mm bore. Key mounting figures: centre height H = 69.8 mm, overall base length L = 241 mm, bolt-hole spacing J = 184 mm, and each of the two feet takes a 20 mm (M16) fastener for the 60 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC212D1 insert are 58 kN dynamic and 36 kN static; the assembled UCP212 weighs about 4.7 kg.",
    "applications": [
      "sawmill arbors and feed rolls",
      "cement and clinker handling",
      "sugar-mill and fertiliser plant drives",
      "long line-shafting where several units must share a straight reference"
    ],
    "failure_modes": [
      "cracked cast ear from mounting on an uneven face and pulling one bolt fully first",
      "housing-foot cracking beside an over-torqued or under-supported foundation bolt",
      "grease starvation on long intervals in hot positions, with the ball set running on dried thickener"
    ],
    "pitfalls": [
      "Heavy drives on UCP212 should have the setscrews re-torqued after the first day; at 60 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.",
      "The standard 2-series insert in UCP212 is the lightest section at 60 mm — do not substitute it into a position that previously ran an X or 3 unit: the 184 mm mounting may match while the load rating does not.",
      "As a pillow block, UCP212 needs a prepared horizontal surface at the 69.8 mm centre height: shim both feet with full-width packs so the 241 mm base seats over its full area.",
      "The lip seals and slingers on UCP212 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.",
      "Never weld a bracket to the P212 housing of UCP212: local heat cracks cast iron and distorts the spherical bore that the insert depends on."
    ],
    "faq": [
      {
        "q": "Does UCP212 interchange with other brands at the same size?",
        "a": "Mounted units of this class follow JIS B 1559 housing and JIS B 1558 insert dimensions, so the shaft size, centre height and 184 mm bolt centres of UCP212 interchange with other makers' equivalent designation. Always re-verify ratings and seal execution rather than assuming the suffix letters match."
      },
      {
        "q": "What are the dimensions of an UCP212 mounted bearing?",
        "a": "UCP212 takes a 60 mm shaft (insert UC212D1, 110 mm OD) and has a unit mass of about 4.7 kg. Housing figures: centre height H 69.8 mm, length L 241 mm, bolt centres J 184 mm, foot holes 20 mm for M16 bolts."
      },
      {
        "q": "What does the UCP212 designation mean?",
        "a": "UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 60 mm bore. UCP212 is built from housing P212 plus insert UC212D1 (D1 = greasable)."
      },
      {
        "q": "How is UCP212 locked to the shaft, and how tight should the setscrews be?",
        "a": "The UC212D1 insert uses two collar setscrews on the 60 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated."
      },
      {
        "q": "When should I choose a pillow block like UCP212 instead of a flanged unit?",
        "a": "Choose the UCP212 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 69.8 mm above the 241 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it."
      }
    ],
    "confidence_score": 0.7,
    "status": "published",
    "last_verified": "2026-09-25",
    "cross_ref": [
      {
        "equiv_sku": "UCP212",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ]
  }
]